Terminal device, base station device, communication method, and integrated circuit

ABSTRACT

To efficiently report channel state information in an uplink. A terminal device includes a transmission unit reporting a first RI for a first CSI process and reporting a second RI for a second CSI process. In a case that in a certain subframe, the first RI report collides with the second RI report, and the first RI and the second RI are reported on an identical physical uplink control channel with a first format, and the first CSI process is not a RI-reference CSI process for the second CSI process, the first RI and the second RI are reported. In a case that the first CSI process is a RI-reference CSI process for the second CSI process, any of the first RI report and the second RI report is dropped.

TECHNICAL FIELD

The present invention relates to a terminal device, a base stationdevice, a communication method, and an integrated circuit.

This application claims priority based on Japanese Patent ApplicationNo. 2015-136567 filed on Jul. 8, 2015, the contents of which areincorporated herein by reference.

BACKGROUND ART

In the 3rd Generation Partnership Project (3GPP), a radio access methodand a radio network for cellular mobile communications (hereinafter,referred to as “Long Term Evolution (LTE)”, or “Evolved UniversalTerrestrial Radio Access (EUTRA)”) have been considered (NPL 1, NPL 2,NPL 3, NPL 4, and NPL 5). In LTE, a base station device is also referredto as an evolved NodeB (eNodeB), and a terminal device is also referredto as User Equipment (UE) or a mobile station device. LTE is a cellularcommunication system in which an area is divided into multiple cells toform a cellular pattern, each of the cells being served by a basestation device. A single base station device may manage multiple cells.

LTE supports a Time Division Duplex (TDD). LTE that employs a TDD schemeis also referred to as TD-LTE or LTE TDD. In TDD, an uplink signal and adownlink signal are time-division multiplexed. LTE supports a FrequencyDivision Duplex (FDD).

In 3GPP, Carrier Aggregation (CA) has been specified in which a terminaldevice can simultaneously perform transmission and/or reception on up tofive serving cells (component carriers: CC).

In 3GPP, a configuration where a terminal device simultaneously performstransmission and/or reception on more than five serving cells (componentcarriers) has been considered. Furthermore, a configuration where aterminal device performs transmission on a Physical Uplink ControlCHannel (PUCCH) in a secondary cell that is a serving cell other than aprimary cell has been considered (NPL 6).

In 3GPP, a configuration where a new format for the PUCCH and/or aPhysical Uplink Shared CHannel (PUSCH) is used to simultaneouslytransmit Channel State Information (CSI) of multiple serving cells hasbeen considered.

CITATION LIST Non-Patent Literature

NPL 1: “3GPP TS 36.211 V12.4.0 (2014-12) Evolved Universal TerrestrialRadio Access (E-UTRA); Physical channels and modulation (Release 12)”, 6Jan. 2015.

NPL 2: “3GPP TS 36.212 V12.3.0 (2014-12) Evolved Universal TerrestrialRadio Access (E-UTRA); Multiplexing and channel coding (Release 12)”, 6Jan. 2015.

NPL 3: “3GPP TS 36.213 V12.4.0 (2014-12) Evolved Universal TerrestrialRadio Access (E-UTRA); Physical layer procedures (Release 12)”, 7 Jan.2015.

NPL 4: “3GPP TS 36.321 V12.4.0 (2014-12) Evolved Universal TerrestrialRadio Access (E-UTRA); Medium Access Control (MAC) protocolspecification (Release 12)”, 5 Jan. 2015.

NPL 5: “3GPP TS 36.331 V12.4.1 (2014-12) Evolved Universal TerrestrialRadio Access (E-UTRA); Radio Resource Control (RRC); Protocolspecification (Release 12)”, 7 Jan. 2015.

NPL 6: “New WI proposal: LTE Carrier Aggregation Enhancement Beyond 5Carriers”, RP-142286, Nokia Corporation, NTT DoCoMo Inc., NokiaNetworks, 3GPP TSG RAN Meeting #66, Hawaii, United States of America,8-11 Dec. 2014.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention

An object of the present invention is to provide a terminal device, abase station device, a communication method, and an integrated circuit,which enable the base station device and the terminal device toefficiently communicate with each other in the radio communicationsystem as described above.

Means for Solving the Problems

(1) In order to accomplish the object described above, aspects of thepresent invention are contrived to provide the following means. To bemore specific, a terminal device in one aspect of the present inventionmay be a terminal device including a transmission unit configured totransmit a first channel state information report, a second channelstate information report, and a scheduling request. In a certainsubframe, in a case that there is only the first channel stateinformation report, the first channel state information report istransmitted on a first PUCCH resource, and in a case that there are thefirst channel state information report and the second channel stateinformation report, the first channel state information report and thesecond channel state information report are transmitted simultaneouslyon a second PUCCH resource different from the first PUCCH resource. Thefirst PUCCH resource is not used for simultaneous transmission of thescheduling request and the first channel state information report, andthe second PUCCH resource is used for simultaneous transmission of thescheduling request, the first channel state information report, and thesecond channel state information report.

(2) A base station device in one aspect of the present invention may bea base station device including a reception unit configured to receive afirst channel state information report, a second channel stateinformation report, and a scheduling request from a terminal device. Ina certain subframe, in a case that there is only the first channel stateinformation report, the first channel state information report isreceived on a first PUCCH resource, and in a case that there are thefirst channel state information report and the second channel stateinformation report, the first channel state information report and thesecond channel state information report are received simultaneously on asecond PUCCH resource different from the first PUCCH resource. The firstPUCCH resource is not used for simultaneous reception of the schedulingrequest and the first channel state information report, and the secondPUCCH resource is used for simultaneous reception of the schedulingrequest, the first channel state information report, and the secondchannel state information report.

(3) A communication method in one aspect of the present invention may bea communication method of a terminal device, the communication methodincluding: transmitting a first channel state information report, asecond channel state information report, and a scheduling request; andin a certain subframe, in a case that there is only the first channelstate information report, transmitting the first channel stateinformation report on a first PUCCH resource, and in a case that thereare the first channel state information report and the second channelstate information report, simultaneously transmitting the first channelstate information report and the second channel state information reporton a second PUCCH resource different from the first PUCCH resource. Thefirst PUCCH resource is not used for simultaneous transmission of thescheduling request and the first channel state information report, andthe second PUCCH resource is used for simultaneous transmission of thescheduling request, the first channel state information report, and thesecond channel state information report.

(4) A communication method in one aspect of the present invention may bea communication method of a base station device, the communicationmethod including: receiving a first channel state information report, asecond channel state information report, and a scheduling request from aterminal device; and in a certain subframe; and in a case that there isonly the first channel state information report, receiving the firstchannel state information report on a first PUCCH resource, and in acase that there are the first channel state information report and thesecond channel state information report, simultaneously receiving thefirst channel state information report and the second channel stateinformation report on a second PUCCH resource different from the firstPUCCH resource. The first PUCCH resource is not used for simultaneousreception of the scheduling request and the first channel stateinformation report, and the second PUCCH resource is used forsimultaneous reception of the scheduling request, the first channelstate information report, and the second channel state informationreport.

(5) An integrated circuit in one aspect of the present invention may bean integrated circuit mounted on a terminal device, causing the terminaldevice to exert a function to transmit a first channel state informationreport, a second channel state information report, and a schedulingrequest. In a certain subframe, in a case that there is only the firstchannel state information report, the first channel state informationreport is transmitted on a first PUCCH resource, and in a case thatthere are the first channel state information report and the secondchannel state information report, the first channel state informationreport and the second channel state information report are transmittedsimultaneously on a second PUCCH resource different from the first PUCCHresource. The first PUCCH resource is not used for simultaneoustransmission of the scheduling request and the first channel stateinformation report, and the second PUCCH resource is used forsimultaneous transmission of the scheduling request, the first channelstate information report, and the second channel state informationreport.

(6) An integrated circuit in one aspect of the present invention may bean integrated circuit mounted on a base station device, causing the basestation device to exert a function to receive a first channel stateinformation report, a second channel state information report, and ascheduling request from a terminal device. In a certain subframe, in acase that there is only the first channel state information report, thefirst channel state information report is received on a first PUCCHresource, and in a case that there are the first channel stateinformation report and the second channel state information report, thefirst channel state information report and the second channel stateinformation report are received simultaneously on a second PUCCHresource different from the first PUCCH resource. The first PUCCHresource is not used for simultaneous reception of the schedulingrequest and the first channel state information report, and the secondPUCCH resource is used for simultaneous reception of the schedulingrequest, the first channel state information report, and the secondchannel state information report.

Effects of the Invention

According to the present invention, a base station device and terminaldevice can efficiently communicate with each other.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a diagram illustrating a concept of a radio communicationsystem according to the present embodiment.

FIG. 2 is a diagram illustrating a configuration of a slot according tothe present embodiment.

FIGS. 3A to 3C are diagrams illustrating PUCCH cell groups according tothe present embodiment.

FIG. 4 is a diagram for illustrating one example of a method for RIreport and CQI report in the present embodiment.

FIG. 5 is a flow diagram illustrating one example of an operation of aterminal device 1 in a case that multiple PUCCHs collide with each otherin the present embodiment.

FIG. 6 is a diagram for describing one example of a dropping rule in acase that multiple CSI reports collide with each other in the presentembodiment.

FIG. 7 is a flow diagram illustrating one example of an operation of theterminal device 1 in the case that multiple CSI reports collide witheach other in the present embodiment.

FIG. 8 is a schematic block diagram illustrating a configuration of theterminal device 1 according to the present embodiment.

FIG. 9 is a schematic block diagram illustrating a configuration of abase station device 3 according to the present embodiment.

MODE FOR CARRYING OUT THE INVENTION

Hereinafter, embodiments of the present invention will be describedbelow.

FIG. 1 is a conceptual diagram of a radio communication system accordingto the present embodiment. In FIG. 1, the radio communication systemincludes terminal devices 1A to 1C and a base station device 3.Hereinafter, each of the terminal devices 1A to 1C is also referred toas a terminal device 1.

Physical channels and physical signals according to the presentembodiment will be described.

In FIG. 1, uplink radio communication from the terminal device 1 to thebase station device 3 uses the following uplink physical channels. Here,the uplink physical channels are used to transmit information outputfrom higher layers.

-   -   ⋅ Physical Uplink Control Channel (PUCCH)    -   ⋅ Physical Uplink Shared Channel (PUSCH)    -   ⋅ Physical Random Access Channel (PRACH)

The PUCCH is used to transmit Uplink Control Information (UCI). Here,the uplink control information may include Channel State Information(CSI) used to indicate a downlink channel state. The uplink controlinformation may include a Scheduling Request (SR) used to request anUL-SCH resource. The uplink control information may include a HybridAutomatic Repeat request ACKnowledgement (HARQ-ACK). The HARQ-ACK mayindicate HARQ-ACK for downlink data (Transport block, Medium AccessControl Protocol Data Unit (MAC PDU), Downlink-Shared Channel (DL-SCH),or Physical Downlink Shared Channel (PDSCH)).

In other words, the HARQ-ACK may indicate an acknowledgement (ACK) or anegative-acknowledgement (NACK). Here, the HARQ-ACK may also be referredto as an ACK/NACK, HARQ feedback, a HARQ acknowledgement, HARQinformation, or HARQ control information.

However, the Channel State Information (CSI) is constituted of a ChannelQuality Indicator (CQI), a Precoding Matrix Indicator (PMI, PrecodingMarix Indicator), a Precoding Type Indicator (PTI), and/or a RankIndicator (RI).

The channel state information may be periodically or aperiodicallyreported from the terminal device 1 to the base station device 3 with aprescribed period. The reported CSI is referred to as CSI report,specifically, the CSI periodically reported is referred to as periodicchannel state information (periodic CSI) or periodic CSI report, and theCSI aperiodically reported is referred to as aperiodic channel stateinformation (aperiodic CSI) or aperiodic CSI report.

The PUSCH is used to transmit uplink data (Uplink-Shared Channel(UL-SCH)). Furthermore, the PUSCH may be used to transmit the HARQ-ACKand/or the CSI along with the uplink data. Furthermore, the PUSCH may beused to transmit the CSI only or the HARQ-ACK and CSI only. In otherwords, the PUSCH may be used to transmit the uplink control informationonly.

Here, the base station device 3 and the terminal device 1 communicate asignal in (transmit and receive a signal to and from) the higher layer.For example, the base station device 3 and the terminal device 1 maytransmit and receive Radio Resource Control (RRC) signaling (alsoreferred to as an RRC message, RRC information) in an RRC layer. Thebase station device 3 and the terminal device 1 may transmit and receivea Medium Access Control (MAC) control element in a MAC layer. Here, theRRC signaling and/or MAC control element is also referred to as higherlayer signaling.

The PUSCH may be used to transmit the RRC signaling and the MAC controlelement. Here, the RRC signaling transmitted from the base stationdevice 3 may be signaling common to multiple terminal devices 1 in acell. The RRC signaling transmitted from the base station device 3 maybe signaling dedicated to a certain terminal device 1 (also referred toas dedicated signaling). In other words, terminal device-unique(UE-specific) information may be transmitted through signaling dedicatedto a certain terminal device 1.

The PRACH is used to transmit a random access preamble. The PRACH may beused for an initial connection establishment procedure, a handoverprocedure, a connection re-establishment procedure, uplink transmissionsynchronization (timing adjustment), and indicating a PUSCH resourcerequest.

In FIG. 1, the following uplink physical signal is used in the uplinkradio communication. Here, the uplink physical signal is not used totransmit information output from the higher layers but is used by aphysical layer.

-   -   ⋅ Uplink Reference Signal (UL RS)

According to the present embodiment, the following two types of uplinkreference signals are used.

-   -   ⋅ Demodulation Reference Signal (DMRS)    -   ⋅ Sounding Reference Signal (SRS)

The DMRS is associated with transmission on the PUSCH or the PUCCH. TheDMRS is time-multiplexed with the PUSCH or the PUCCH. The base stationdevice 3 uses the DMRS in order to perform channel compensation on thePUSCH or the PUCCH. Transmission on both the PUSCH and the DMRS ishereinafter referred to simply as transmission on the PUSCH.Transmission on both the PUCCH and the DMRS is hereinafter referred tosimply as transmission on the PUCCH.

The SRS has no association with transmission on the PUSCH or the PUCCH.The base station device 3 uses the SRS in order to measure an uplinkchannel state.

In FIG. 1, the following downlink physical channels are used fordownlink radio communication from the base station device 3 to theterminal device 1. Here, the downlink physical channel is used totransmit the information output from higher layers.

-   -   ⋅ Physical Broadcast Channel (PBCH)    -   ⋅ Physical Control Format Indicator Channel (PCFICH)    -   ⋅ Physical Hybrid automatic repeat request Indicator Channel        (PHICH)    -   ⋅ Physical Downlink Control Channel (PDCCH)    -   ⋅ Enhanced Physical Downlink Control Channel (EPDCCH)    -   ⋅ Physical Downlink Shared Channel (PDSCH)    -   ⋅ Physical Multicast Channel (PMCH)

The PBCH is used to broadcast a Master Information Block (MIB), or aBroadcast Channel (BCH), that is shared by the terminal devices 1.

The PCFICH is used to transmit information indicating a region (OFDMsymbols) to be used for transmission on the PDCCH.

The PHICH is used to transmit a HARQ indicator (HARQ feedback orresponse information) indicating an ACKnowledgement (ACK) or a NegativeACKnowledgement (NACK) with respect to the uplink data (Uplink SharedChannel (UL-SCH)) received by the base station device 3.

The PDCCH and the EPDCCH are used to transmit Downlink ControlInformation (DCI). Here, multiple DCI formats are defined fortransmission of the downlink control information. In other words, afield for the downlink control information is defined in a DCI formatand is mapped to information bits.

For example, as the downlink DCI formats, DCI formats (e.g., DCI format1A and DCI format 1C) to be used for the scheduling of one PDSCH in onecell (transmission of a single downlink transport block) may be defined.

Here, each of the downlink DCI formats includes information on thescheduling of the PDSCH. For example, the downlink DCI format includesdownlink control information such as a Carrier Indicator Field (CIF),information on resource block assignment, information on a Modulationand Coding Scheme (MCS), or information (Precoding information) forindicating the number of transmission layers in the PUSCH transmission.Here, the downlink DCI format is also referred to as downlink grant ordownlink assignment.

Furthermore, for example, as DCI formats for uplink, DCI formats (e.g.,DCI format 0 and DCI format 4) to be used for the scheduling of onePUSCH in one cell (transmission of a single uplink transport block) aredefined.

Here, each of the uplink DCI formats includes information on thescheduling of the PUSCH. For example, the uplink DCI format includesdownlink control information such as a Carrier Indicator Field (CIF),information on Resource block assignment and/or hopping resourceallocation, information on Modulation and coding scheme (MCS) and/orredundancy version, or information (Precoding information and the numberof layers) used for indicating the number of transmission layers in thePUSCH transmission. Here, the uplink DCI format is also referred to asuplink grant or Uplink assignment.

In a case that a PDSCH resource is scheduled in accordance with thedownlink assignment, the terminal device 1 may receive downlink data onthe scheduled PDSCH. In a case that a PUSCH resource is scheduled inaccordance with the uplink grant, the terminal device 1 may transmituplink data and/or uplink control information on the scheduled PUSCH.

In the present embodiment, the PDCCH and the EPDCCH are alsocollectively referred to simply as a PDCCH. In the present embodiment, aPDCCH candidate and an EPDCCH candidate are also collectively referredto simply as a PDCCH candidate.

Here, an RNTI assigned to the terminal device 1 by the base stationdevice 3 is used for the transmission of the downlink controlinformation (transmission on the PDCCH). Specifically, Cyclic Redundancycheck (CRC) parity bits are attached to the DCI format (or downlinkcontrol information), and after the attachment, the CRC parity bits arescrambled with the RNTI. Here, the CRC parity bits attached to the DCIformat may be obtained from a payload of the associated DCI format.

The terminal device 1 attempts to decode the DCI format to which the CRCparity bits scrambled with the RNTI have been attached, and detects, asa DCI format destined for the terminal device 1 itself, the DCI formatfor which the CRC has been successful (also referred to as blindcoding). In other words, the terminal device 1 may detect the PDCCH withthe CRC scrambled with the RNTI. The terminal device 1 may detect thePDCCH including the DCI format to which the CRC parity bits scrambledwith the RNTI have been attached.

Here, the RNTI may include a Cell-Radio Network Temporary Identifier(C-RNTI). The C-RNTI is an identifier unique to the terminal device 1and used for the identification in RRC connection and scheduling. TheC-RNTI may be used for dynamically scheduled unicast transmission.

The RNTI may further include a Semi-Persistent Scheduling C-RNTI (SPSC-RNTI). The SPS C-RNTI is an identifier unique to the terminal device 1and used for semi-persistent scheduling. The SPS C-RNTI may be used forsemi-persistently scheduled unicast transmission.

The RNTI may include a Temporary C-RNTI. Here, the Temporary C-RNTI isan identifier which is used during a contention-based random accessprocedure and unique to a preamble transmitted by the terminal device 1.The Temporary C-RNTI may be used for dynamically scheduled transmission.

The PDSCH is used to transmit the downlink data (Downlink Shared Channel(DL-SCH)). The PDSCH is used to transmit a system information message.Here, the system information message may be cell-specific (cell-unique)information. The system information is included in the RRC signaling.The PDSCH is used to transmit the RRC signaling and the MAC controlelement.

The PMCH is used to transmit multicast data (Multicast Channel (MCH)).

In FIG. 1, the following downlink physical signals are used in thedownlink radio communication. Here, the downlink physical signals arenot used to transmit the information output from the higher layers butare used by the physical layer.

-   -   ⋅ Synchronization signal (SS)    -   ⋅ Downlink Reference Signal (DL RS)

The synchronization signal is used in order for the terminal device 1 tobe synchronized in terms of frequency and time domains for downlink. Ina TDD scheme, the synchronization signal is mapped to subframes 0, 1, 5,and 6 within a radio frame. In a FDD scheme, the synchronization signalis mapped to subframes 0 and 5 within a radio frame.

The downlink reference signal is used in order for the terminal device 1to perform the channel compensation on the downlink physical channel.The downlink reference signal is used in order for the terminal device 1to calculate the downlink CSI.

In the present embodiment, the following five types of downlinkreference signals are used.

-   -   ⋅ Cell-specific Reference Signal (CRS)    -   ⋅ UE-specific Reference Signal (URS) associated with the PDSCH    -   ⋅ Demodulation Reference Signal (DMRS) associated with the        EPDCCH    -   ⋅ Non-Zero Power Channel State Information-Reference Signal (NZP        CSI-RS)    -   ⋅ Zero Power Channel State Information-Reference Signal (ZP        CSI-RS) Multimedia Broadcast and Multicast Service over Single        Frequency Network Reference signal (MBSFN RS)    -   ⋅ Positioning Reference Signal (PRS)

Here, the downlink physical channel and the downlink physical signal arecollectively referred to as a downlink signal. The uplink physicalchannel and the uplink physical signal are collectively referred to asan uplink signal. The downlink physical channel and the uplink physicalchannel are collectively referred to as a physical channel. The downlinkphysical signal and the uplink physical signal are collectively referredto as a physical signal.

The BCH, the MCH, the UL-SCH, and the DL-SCH are transport channels. Achannel used in the Medium Access Control (MAC) layer is referred to asa transport channel. The unit of the transport channel used in the MAClayer is referred to as a transport block (TB) or a MAC Protocol DataUnit (PDU). Control of a Hybrid Automatic Repeat reQuest (HARQ) isperformed for each transport block in the MAC layer. The transport blockis a unit of data that the MAC layer delivers to the physical layer. Inthe physical layer, the transport block is mapped to a codeword, andcoding processing is performed on a codeword-by-codeword basis.

The terminal device 1 switches and uses multiple transmission modes,such as single antenna transmission, transmit diversity, and MultipleInput Multiple Output (MIMO), which are different in a usabletransmission method. For example, the transmission mode specified by thebase station from among transmission modes 1 to 10 is used. For example,transmission mode 10 is a transmission mode capable of configuringmultiple CSI processes.

The carrier aggregation will be described below.

In the present embodiment, one or multiple serving cells may beconfigured for the terminal device 1. A technology in which the terminaldevice 1 communicates via multiple serving cells is referred to ascarrier aggregation or cell aggregation.

Here, the present embodiment may apply to one or each of the multipleserving cells configured for the terminal device 1. Alternatively, thepresent embodiment may apply to one or some of the multiple servingcells configured for the terminal device 1. Alternatively, the presentembodiment may apply to one or each of the multiple serving cell groups(for example, PUCCH cell groups) configured for the terminal device 1,which will be described below. Alternatively, the present embodiment mayapply to one or some of the multiple serving cell groups configured forthe terminal device 1.

In the present embodiment, the Time Division Duplex (TDD) and/orFrequency Division Duplex (FDD) may be applied. Here, for carrieraggregation, the TDD or FDD may apply to one or all of the multipleserving cells. Alternatively, for career aggregation, the servingcell(s) to which the TDD applies and the serving cell(s) to which theFDD applies may be aggregated. Here, a frame structure for the FDD isalso referred to as Frame structure type 1. A frame structure for theTDD is also referred to as Frame structure type 2.

Here, the configured one or multiple serving cells include one primarycell and one or multiple secondary cells. The primary cell may be aserving cell on which an initial connection establishment procedure hasbeen performed, a serving cell in which a connection re-establishmentprocedure has been started, or a cell indicated as a primary cell duringa handover procedure. At a point of time when an RRC connection isestablished, or later, the secondary cell(s) may be configured.

Here, a carrier corresponding to a serving cell in the downlink isreferred to as a downlink component carrier. A carrier corresponding toa serving cell in the uplink is referred to as an uplink componentcarrier. The downlink component carrier and the uplink component carrierare collectively referred to as a component carrier.

The terminal device 1 may simultaneously perform transmission and/orreception on multiple physical channels in one or multiple serving cells(component carrier(s)). Here, transmission on one physical channel maybe performed in one serving cell (component carrier) of the multipleserving cells (component carriers).

Here, the primary cell is used for transmission on the PUCCH. Theprimary cell is not deactivated. Cross-carrier scheduling does not applyto the primary. In other words, the primary cell is always scheduled viaits PDCCH.

In a case that a PDCCH (or PDCCH monitoring) is configured in a certainsecondary cell, the cross-carrier scheduling may not apply to thecertain secondary cell. In other words, in this case, the secondary cellmay be always scheduled via its PDCCH. In a case that no PDCCH (or PDCCHmonitoring) is configured in a certain secondary cell, the cross-carrierscheduling applies to the secondary cell, and the certain secondary cellmay always be scheduled via the PDCCH in one other serving cell.

Here, in the present embodiment, a secondary cell used for transmissionon the PUCCH is referred to as a PUCCH secondary cell or a specialsecondary cell. A secondary cell not used for transmission on the PUCCHis referred to as a non-PUCCH secondary cell, a non-special secondarycell, a non-PUCCH serving cell, or a non-PUCCH cell. The primary celland the PUCCH secondary cell are collectively referred to as a PUCCHserving cell and PUCCH cell.

Here, the PUCCH serving cell (primary cell, PUCCH secondary cell) alwayshas the downlink component carrier and the uplink component carrier. APUCCH resource is configured in the PUCCH serving cell (primary cell,PUCCH secondary cell).

The non-PUCCH serving cell (non-PUCCH secondary cell) may have only thedownlink component carrier. The non-PUCCH serving cell (non-PUCCHsecondary cell) may have the downlink component carrier and the uplinkcomponent carrier.

The terminal device 1 may perform transmission on the PUCCH in the PUCCHserving cell. In other words, the terminal device 1 may performtransmission on the PUCCH in the primary cell. Moreover, the terminaldevice 1 may perform transmission on the PUCCH in the PUCCH secondarycell. In other words, the terminal device 1 does not performtransmission on the PUCCH in the non-special secondary cell.

Here, the PUCCH secondary cell may be defined as a serving cell that isneither a primary cell nor a secondary cell.

In other words, the PUCCH secondary cell may be used for transmission onthe PUCCH. Here, the PUCCH secondary cell may not be deactivated. ThePUCCH secondary cell may be activated and/or deactivated as describedbelow.

The cross-carrier scheduling may not apply to the PUCCH secondary cell.

In other words, the PUCCH secondary cell may be always scheduled via aPDCCH in the PUCCH secondary cell. Here, the cross-carrier schedulingmay apply to the PUCCH secondary cell. In other words, the PUCCHsecondary cell may be scheduled via the PDCCH of one other serving cell.

For example, in a case that a PDCCH (or PDCCH monitoring) is configuredin the PUCCH secondary cell, the cross-carrier scheduling may not applyto the PUCCH secondary cell. In other words, in this case, the PUCCHsecondary cell may be always scheduled via its PDCCH. In a case that noPDCCH (or PDCCH monitoring) is configured in the PUCCH secondary cell,the cross-carrier scheduling applies, and the PUCCH secondary cell mayalways be scheduled via the PDCCH in another serving cell.

Here, linking may be defined between the uplink (e.g., uplink componentcarrier) and the downlink (e.g., the downlink component carrier). Inother words, in accordance with the linking between the uplink and thedownlink, the serving cell for downlink assignment (serving cell inwhich transmission (downlink transmission) on the PDSCH scheduled viathe downlink assignment is performed) may be identified. In accordancewith the linking between the uplink and the downlink, the serving cellfor uplink grant (serving cell in which transmission on the PUSCHscheduled via uplink grant (uplink transmission) is performed) may beidentified. Here, there is no carrier indicator field in the downlinkassignment or the uplink.

In other words, the downlink assignment received in the primary cell maycorrespond to downlink transmission in the primary cell. Moreover, theuplink grant received in the primary cell may correspond to uplinktransmission in the primary cell. The downlink assignment received inthe PUCCH secondary cell may correspond to downlink transmission in thePUCCH secondary cell. Moreover, the uplink grant received in the PUCCHsecondary cell may correspond to uplink transmission in the PUCCHsecondary cell.

The downlink assignment received in a certain secondary cell (PUCCHsecondary cell and/or non-PUCCH secondary cell) may correspond to thedownlink transmission in the certain secondary cell. The uplink grantreceived in a certain secondary cell (PUCCH secondary cell and/ornon-PUCCH secondary cell) may correspond to the uplink transmission inthe certain secondary cell.

Here, the base station device 3 may configure one or multiple servingcells through higher layer signaling. For example, one or multiplesecondary cells may be configured to form a set of multiple servingcells with a primary cell. Here, the serving cells configured by thebase station device 3 may include a PUCCH secondary cell.

In other words, the PUCCH secondary cell may be configured by the basestation device 3. For example, the base station device 3 may transmitthe higher layer signaling that includes information (index) used toconfigure the PUCCH secondary cell.

The base station device 3 may activate or deactivate one or multipleserving cells through the higher layer signaling (e.g., the MAC controlelement). For example, the activation or deactivation mechanism may bebased on a combination of the MAC control element and a deactivationtimer.

Here, secondary cells activated or deactivated by the base stationdevice 3 may include a PUCCH secondary cell. To be more specific, thebase station device 3 may solely activate or deactivate multiplesecondary cells including the PUCCH secondary cell through a singleactivation/deactivation command. In other words, the base station device3 may transmit the single command to be used to activate or deactivatethe secondary cells through the MAC control element.

As a value of the deactivation timer, a common value may be configuredfor each terminal device 1 by the higher layers (e.g., the RRC layer).The deactivation timer (the value of the timer) may be maintained for(apply to) each of the secondary cells. Here, the deactivation timer(the value of the timer) may be maintained for each of the non-PUCCHsecondary cells only. In other words, the terminal device 1 may maintain(apply) the deactivation timer for (to) each of the non-PUCCH secondarycells only, without applying the deactivation timer to the PUCCHsecondary cells.

Alternatively, a deactivation timer for PUCCH secondary cells and adeactivation timer for non-PUCCH secondary cells may be configuredseparately. For example, the base station device 3 may transmit thehigher layer signaling including the deactivation timer for the PUCCHsecondary cells and information on the configuration of the deactivationtimer. Moreover, the base station device 3 may transmit the higher layersignaling including the deactivation timer for the non-PUCCH secondarycells and information on the configuration of the deactivation timer.

A configuration of a slot according to the present embodiment will bedescribed below.

FIG. 2 is a diagram illustrating the configuration of the slot accordingto the present embodiment. In FIG. 2, the horizontal axis represents atime axis, and the vertical axis represents a frequency axis. Here, anormal Cyclic Prefix (CP) may apply to an OFDM symbol. Alternatively, anextended Cyclic Prefix (CP) may apply to the OFDM symbol. The physicalsignal or the physical channel transmitted in each of the slots isexpressed by a resource grid.

In the downlink, the resource grid may be defined by multiplesubcarriers and multiple OFDM symbols. In the uplink, the resource gridmay be defined by multiple subcarriers and multiple SC-FDMA symbols. Thenumber of subcarriers constituting one slot may depend on a cellbandwidth. The number of OFDM symbols or SC-FDMA symbols constitutingone slot may be seven. Each element within the resource grid is referredto as a resource element. The resource element may be identified by asubcarrier number, and an OFDM symbol or SC-FDMA symbol number.

A resource block may be used to express mapping of a certain physicalchannel (the PDSCH, the PUSCH, or the like) to the resource elements.The resource block may be defined by a virtual resource block and aphysical resource block. A certain physical channel may be first mappedto the virtual resource block. Thereafter, the virtual resource blockmay be mapped to the physical resource block. One physical resourceblock may be defined by seven consecutive OFDM symbols or SC-FDMAsymbols in a time domain and by 12 consecutive subcarriers in afrequency domain. Therefore, one physical resource block may beconstituted of (7×12) resource elements. Furthermore, one physicalresource block may correspond to one slot in the time domain andcorrespond to 180 kHz in the frequency domain. The physical resourceblocks may be numbered from 0 in the frequency domain.

FIGS. 3A to 3C are diagrams illustrating cell groups according to thepresent embodiment. FIG. 3A to 3C respectively illustrate three examples(Example (a), Example (b), and Example (c)) as examples of aconfiguration (constitution, definition) of the PUCCH cell group. Here,in the present embodiment, a group of one or multiple serving cells isreferred to as a PUCCH cell group. The PUCCH cell group may be a groupassociated with transmission on the PUCCH (transmission of uplinkcontrol information on the PUCCH). Here, a certain serving cell belongsto any one of the PUCCH cell groups. Here, it goes without saying thatthe PUCCH cell group may be configured differently from the examplesillustrated in FIGS. 3A to 3C.

Here, the PUCCH cell group may be configured by the base station device3. For example, the base station device 3 may transmit the higher layersignaling that includes information (or index, cell group index) used toconfigure the PUCCH cell group.

Here, the present embodiment can be, of course, applied to a group ofone or multiple serving cells different from the PUCCH cell groupdescribed above. For example, the base station device 3 may configure agroup of one or multiple serving cells to correspond to the servingcells indicated using a carrier indicator field (CIF). In other words,the base station device 3 may configure one or multiple serving cells inassociation with the uplink transmission. The base station device 3 mayconfigure a group of one or multiple serving cells in association withthe downlink transmission.

Hereinafter, the group of one or multiple serving cells configured bythe base station device 3 is also referred to as a cell group.Specifically, the PUCCH cell group is included in the cell group. Here,the base station device 3 and/or the terminal device 1 may perform theoperations described in the present embodiment in each cell group. To bemore specific, the base station device 3 and/or the terminal device 1may perform the operations described in the present embodiment in onePUCCH cell group.

Here, the base station device 3 and/or the terminal device 1 may supportthe carrier aggregation of up to 32 downlink component carriers(downlink cells), for example. In other words, the base station device 3and/or the terminal device 1 can simultaneously perform transmissionand/or reception of multiple physical channels in up to 32 servingcells. Here, the number of uplink component carriers may be less thanthe number of downlink component carriers.

The base station device 3 and/or the terminal device 1 may support thecarrier aggregation of up to 5 downlink component carriers (downlinkcells), for example. In other words, the base station device 3 and/orthe terminal device 1 can simultaneously perform transmission and/orreception of multiple physical channels in up to 5 serving cells. Here,the number of uplink component carriers may be less than the number ofdownlink component carriers.

FIG. 3A illustrates a configuration where a first cell group and asecond cell group are configured as the cell groups (PUCCH cell groups,here). For example, in FIG. 3A, the base station device 3 may transmit adownlink signal in the first cell group, and the terminal device 3 maytransmit an uplink signal in the first cell group (may transmit theuplink control information on the PUCCH in the first cell group). Forexample, in a case that 20 serving cells (downlink component carriers ordownlink cells) are configured or activated in the first cell group, thebase station device 3 and the terminal device 1 may transmit and receivethe uplink control information for the 20 downlink component carriers toand from each other.

To be more specific, the terminal device 1 may transmit the HARQ-ACKcorresponding to 20 downlink component carriers (HARQ-ACK fortransmission on the PDSCH and HARQ-ACK for transport blocks). Theterminal device 1 may transmit the CSI corresponding to 20 downlinkcomponent carriers. Moreover, the terminal device 1 may transmit the SRfor each cell group. Similarly, the base station device 3 and theterminal device 1 may transmit and receive the uplink controlinformation to and from each other in the second cell group.

Similarly, the base station device 3 and the terminal device 1 mayconfigure a cell group as illustrated in FIG. 3B, and transmit andreceive the uplink control information to and from each other. The basestation device 3 and the terminal device 1 may configure a cell group asillustrated in FIG. 3C, and transmit and receive the uplink controlinformation to and from each other.

Here, one cell group (e.g., PUCCH cell group) may include at least oneserving cell (e.g., PUCCH serving cell). One cell group (e.g., PUCCHcell group) may include only one serving cell (e.g., PUCCH serving cellonly). For example, one PUCCH cell group may include one PUCCH servingcell, and one or multiple non-PUCCH serving cells.

Here, a cell group including the primary cell is referred to as aprimary cell group. A cell group not including the primary cell isreferred to as a secondary cell group. A PUCCH cell group including theprimary cell is referred to as a primary PUCCH cell group. A PUCCH cellgroup not including the primary cell is referred to as a secondary PUCCHcell group.

In other words, a secondary PUCCH cell group may include a PUCCHsecondary cell. For example, the index for the primary PUCCH cell groupmay always be defined as 0. The index for the secondary PUCCH cell groupmay be configured by the base station device 3 (or a network device).

The base station device 3 may transmit information used to indicate thePUCCH secondary cell in a state that the information is included in thehigher layer signaling and/or the PDCCH (the downlink controlinformation transmitted on the PDCCH). The terminal device 1 maydetermine the PUCCH secondary cell in accordance with the informationused to indicate the PUCCH secondary cell. Here, a cell index of thePUCCH secondary cell may be defined by a specification or the like inadvance.

As described above, the PUCCH in the PUCCH serving cell may be used totransmit the uplink control information (HARQ-ACK, CSI (e.g., periodicCSI) and/or SR) with respect to a serving cell (PUCCH serving cell,non-PUCCH serving cell) included in the PUCCH cell group to which thePUCCH serving cell belongs.

In other words, the uplink control information (HARQ-ACK, CSI (e.g.,periodic CSI), and/or SR) with respect to the serving cell (PUCCHserving cell or non-PUCCH serving cell) included in the PUCCH cell groupis transmitted on the PUCCH in the PUCCH serving cell included in thePUCCH cell group.

Here, the present embodiment may apply only to transmission of HARQ-ACK.Alternatively, the present embodiment may apply only to transmission ofCSI (e.g., periodic CSI). Alternatively, the present embodiment mayapply only to transmission of SR. Alternatively, the present embodimentmay apply to transmission of HARQ-ACK, transmission of CSI (e.g.,periodic CSI), and/or transmission of SR.

In other words, a cell group (or PUCCH cell group) for transmission ofHARQ-ACK may be configured. A cell group (or PUCCH cell group) fortransmission of CSI (e.g., periodic CSI) may be configured. A cell group(or PUCCH cell group) for transmission of SR may be configured.

For example, the cell group for transmission of HARQ-ACK, the cell groupfor transmission of CSI (e.g., periodic CSI), and/or the cell group fortransmission of SR may be configured separately. Alternatively, a commoncell group may be configured as the cell group for transmission ofHARQ-ACK, the cell group for transmission of CSI (e.g., periodic CSI),and/or the cell group for transmission of SR.

Here, the number of cell groups for transmission of HARQ-ACK may be oneor two. The number of cell groups for transmission of CSI may be one ortwo.

The number of cell groups for transmission of SR may be one or two. Thecell group for transmission of CSI (e.g., periodic CSI) and/or the cellgroup for transmission of SR does not need to be configured (defined).

Here, multiple formats may be defined (supported) for the PUCCH. Eachformat supported for the PUCCH (the format that the PUCCH supports) isalso referred to as a PUCCH format. For example, the use of thefollowing PUCCH formats allows combinations of pieces of uplink controlinformation on the PUCCH (transmission of combinations of pieces ofuplink control information) to be supported.

-   -   ⋅ Format 1    -   ⋅ Format 1a    -   ⋅ Format 1b    -   ⋅ Format 2    -   ⋅ Format 2a    -   ⋅ Format 2b    -   ⋅ Format 3    -   ⋅ Format 4    -   (⋅ Format 4a)    -   (⋅ Format 4b)

PUCCH format 1 may be defined for a positive SR. For example, thepositive SR may be used to indicate that an UL-SCH resource isrequested. Here, a negative SR may be used to indicate that an UL-SCHresource is not requested. PUCCH format 1 is also referred to as a firstPUCCH format below.

PUCCH format 1a may be defined for 1-bit HARQ-ACK or 1-bit HARQ-ACK withpositive SR. PUCCH format 1b may be defined for 2-bit HARQ-ACK or 2-bitHARQ-ACK with positive SR. PUCCH format 1b may be defined fortransmission of up to 4-bit HARQ-ACK with channel selection. PUCCHformat 1a and/or PUCCH format 1b is also referred to as a second PUCCHformat below.

PUCCH format 2 may be defined for a CSI report when not multiplexed withHARQ-ACK. PUCCH format 2a may be defined for a CSI report multiplexedwith 1-bit HARQ-ACK. PUCCH format 2b may be defined for a CSI reportmultiplexed with 2-bit HARQ-ACK. Here, PUCCH format 2 may be defined fora CSI report multiplexed with HARQ-ACK for extended cyclic prefix. PUCCHformat 2, PUCCH format 2a, and/or PUCCH format 2b is also referred to asa third PUCCH format below.

PUCCH format 3 may be defined for up to 10-bit HARQ-ACK. For example,PUCCH format 3 may be defined for up to 10-bit HARQ-ACK for FDD orFDD-TDD primary cell frame structure type 1.

PUCCH format 3 may be defined for up to 20-bit HARQ-ACK. For example,PUCCH format 3 may be defined for up to 20-bit HARQ-ACK for TDD. PUCCHformat 3 may be defined for up to 21-bit HARQ-ACK. For example, PUCCHformat 3 may be defined for up to 21-bit HARQ-ACK for FDD-TDD primarycell frame structure type 2.

Alternatively, PUCCH format 3 may be defined for up to 11-bitcorresponding to up to 10-bit HARQ-ACK and 1-bit positive/negative SR.For example, PUCCH format 3 may be defined for up to 11-bitcorresponding to up to 10-bit HARQ-ACK and 1-bit positive/negative SRfor FDD or FDD-TDD.

Alternatively, PUCCH format 3 may be defined for up to 21-bitcorresponding to up to 20-bit HARQ-ACK and 1-bit positive/negative SR.For example, PUCCH format 3 may be defined for up to 21-bitcorresponding to up to 20-bit HARQ-ACK and 1-bit positive/negative SRfor TDD. Alternatively, PUCCH format 3 may be defined for up to 22-bitcorresponding to up to 21-bit HARQ-ACK and 1-bit positive/negative SR(up to 22-bit corresponding to up to 20-bit HARQ-ACK and 1-bitpositive/negative SR). For example, PUCCH format 3 may be defined for upto up to 22-bit corresponding to up to 21-bit HARQ-ACK and 1-bitpositive/negative SR for FDD-TDD primary cell frame structure type 2.

Here, in a case that the uplink control information (HARQ-ACK, SR,and/or CSI) is transmitted using PUCCH format 3, a first coding method(e.g., Reed-Muller code (Reed-Muller coding) or a (32, 0) block code((32, 0) block coding)) may be used. Here, for example, Basis sequencesfor the (32, 0) block code may be given by a specification or the likein advance.

PUCCH format 3 may be defined for HARQ-ACK and a CSI report for oneserving cell. Alternatively, PUCCH format 3 may be defined for HARQ-ACKand one CSI report for one serving cell. Alternatively, PUCCH format 3may be defined for multiple CSI reports. Alternatively, PUCCH format 3may be defined for HARQ-ACK and multiple CSI reports. Alternatively,PUCCH format 3 may be defined for HARQ-ACK, 1-bit positive/negative SR(if any), and a CSI report for one serving cell. Alternatively, PUCCHformat 3 may be defined for HARQ-ACK, 1-bit positive/negative SR (ifany), and one CSI report. Alternatively, PUCCH format 3 may be definedfor HARQ-ACK, 1-bit positive/negative SR (if any), and multiple CSIreports. PUCCH format 3 is also referred to as a fourth PUCCH formatbelow.

PUCCH format 4 may be defined for HARQ-ACK corresponding to up to 32serving cells (downlink component carriers or downlink cells).Alternatively, PUCCH format 4 may be defined for HARQ-ACK and one ormultiple CSI reports. Alternatively, PUCCH format 4 may be defined forHARQ-ACK and SR. Alternatively, PUCCH format 4 may be defined forHARQ-ACK, SR, and one or multiple CSI reports. In other words, PUCCHformat 4 may be used to simultaneously transmit the SR, and one ormultiple CSI reports. Here, the one or multiple CSI reports may be theCSI report(s) for one serving cell. Alternatively, the one or multipleCSI reports may be the CSI report(s) for multiple serving cells.Alternatively, the one or multiple CSI reports may include one CSIreport for one CSI process for one serving cell. Alternatively, the oneor multiple CSI reports may be one CSI report for one CSI process.Alternatively, the one or multiple CSI reports may be multiple CSIreports for multiple CSI processes. Alternatively, the one or multipleCSI reports may include one CSI report for one subframe set for oneserving cell. Alternatively, the one or multiple CSI reports may bemultiple reports for multiple subframe sets. The SR may be positive SRand/or negative SR. However, PUCCH format 4 may not be common to thecase used for HARQ-ACK, the case used for one or multiple CSI reportsfor multiple serving cell or multiple CSI processes, and the case usedto simultaneously transmitting HARQ-ACK and one or multiple CSI reports,and the different PUCCH format may be used in any of those cases. (Forexample, PUCCH format 4, PUCCH format 4a and PUCCH format 4b may bedefined for respective cases) PUCCH format 4 (which may include PUCCHformat 4a and PUCCH format 4b) is also referred to as a fifth PUCCHformat below.

Here, in a case that the uplink control information is transmitted withthe fifth PUCCH format, a second coding method (e.g., a Tail bitingconvolutional encoder (Tail biting convolutional coding) or a Turboencoder (Turbo coding) may be used.

In other words, the number of bits per subframe to be transmitted(transmittable) with the fifth PUCCH format may be larger than thenumber of bits per subframe to be transmitted (transmittable) with thefourth PUCCH format. To be more specific, an information amount persubframe to be transmitted (transmittable) with the fifth PUCCH formatmay be larger than an information amount per subframe to be transmitted(transmittable) with the fourth PUCCH format. As described above, thecoding method used may be different between the transmission of theuplink control information with the fourth PUCCH format and thetransmission of the uplink control information with the fifth PUCCHformat.

Here, in the case that the HARQ-ACK is transmitted with the third PUCCHformat, the terminal device 1 may determine the number of HARQ-ACK bits,at least based on the number of configured serving cells and thedownlink transmission mode configured for each serving cell (each of theconfigured serving cells). In the case that the HARQ-ACK is transmittedwith the fifth PUCCH format, the terminal device 1 may determine thenumber of HARQ-ACK bits, at least based on the number of configured oractivated serving cells and the downlink transmission mode configuredfor each serving cell (each of the configured or activated servingcells).

In the case that the HARQ-ACK is transmitted with the fourth PUCCHformat, the terminal device 1 may determine the number of HARQ-ACK bits,at least based on the number of configured serving cells and thedownlink transmission mode configured for each serving cell (each of theconfigured serving cells). In the case that the HARQ-ACK is transmittedwith the fifth PUCCH format, the terminal device 1 may determine thenumber of HARQ-ACK bits, at least based on the number of configured oractivated serving cells and the downlink transmission mode configuredfor each serving cell (each of the configured or activated servingcells).

Here, for example, the terminal device 1 may use 2-bit HARQ-ACK bit fora serving cell configured in a downlink transmission mode that supportsup to two transport blocks, and use 1-bit HARQ-ACK bit otherwise (e.g.,for a serving cell configured in a downlink transmission mode thatsupports one transport block).

Here, for example, the downlink transmission mode that supports up totwo transport blocks may include transmission mode 3, transmission mode4, transmission mode 8, transmission mode 9, and/or transmission mode10. The downlink transmission mode that supports one transport block mayinclude transmission mode 1, transmission mode 2, transmission mode 5,transmission mode 6, and/or transmission mode 7.

As described above, the base station device 3 may use the higher layersignaling (e.g., RRC signaling) to configure the serving cell for theterminal device 1. The base station device 3 may use the higher layersignaling to configure the downlink transmission mode (e.g., RRCsignaling) for the terminal device 1. For example, the base stationdevice 3 may configure the downlink transmission mode associated withtransmission on the PDSCH for the terminal device 1. In other words,with respect to the transmission of HARQ-ACK with the fourth PUCCHformat and/or the fifth PUCCH format, the number of HARQ-ACK bits may bedetermined in the RRC layer (based on the information in the RRC layer).

Here, the base station device 3 may use the higher layer signaling(information transmitted through the higher layer signaling) and/or thePDCCH (downlink control information transmitted on the PDCCH) to make aconfiguration in order for the terminal device 1 to use any one of PUCCHformat 1b with channel selection, PUCCH format 3, or PUCCH format 4 (orPUCCH format 4a and/or PUCCH format 4b) for the transmission of theuplink control information (e.g. the transmission of HARQ-ACK). In otherwords, the base station device 3 may make a configuration in order forthe terminal device 1 to use PUCCH format 1b with channel selection forthe transmission of the uplink control information. The base stationdevice 3 may make a configuration in order for the terminal device 1 touse PUCCH format 3 for the transmission of the uplink controlinformation. Alternatively, the base station device 3 may make aconfiguration in order for the terminal device 1 to use PUCCH format 4(or PUCCH format 4a and/or PUCCH format 4b) for the transmission of theuplink control information.

For example, the base station device 3 may make a configuration in orderfor the terminal device 1 to use any one of PUCCH format 1b with channelselection, PUCCH format 3, or PUCCH format 4 (or PUCCH format 4a and/orPUCCH format 4b), for each cell group. In other words, the base stationdevice 3 may make a configuration in order for the terminal device 1 touse any one of PUCCH format 1b with channel selection, PUCCH format 3,or PUCCH format 4 (or PUCCH format 4a and/or PUCCH format 4b)independently for each cell group. In other words, the terminal device 1may be configured by the base station device 3 to use any one of PUCCHformat 1b with channel selection, PUCCH format 3, or PUCCH format 4 (orPUCCH format 4a and/or PUCCH format 4b).

In a case that more than one serving cell (more than one and up to fiveserving cells) with frame structure type 1 and/or frame structure type 2is configured for the terminal device 1, the terminal device 1 may beconfigured by the base station device 3 to use any one of PUCCH format1b with channel selection, PUCCH format 3, or PUCCH format 4 (or PUCCHformat 4a and/or PUCCH format 4b). In a case that more than five servingcells with frame structure type 1 and/or frame structure type 2 areconfigured for the terminal device 1, the terminal device 1 may beconfigured by the base station device 3 to use any one of PUCCH format1b with channel selection, PUCCH format 3, or PUCCH format 4 (or PUCCHformat 4a and/or PUCCH format 4b).

The base station device 3 may indicate (configure or allocate) a PUCCHresource to the terminal device 1. Here, the PUCCH resource may includea first PUCCH resource (also referred to as n(1)PUCCH), a second PUCCHresource (also referred to as n(2)PUCCH), a third PUCCH resource (alsoreferred to as n(3)PUCCH), and a fourth PUCCH resource (also referred toas n(4)PUCCH).

For example, the base station device 3 may transmit the higher layersignaling including first information to be used to configure the firstPUCCH resource. For example, the SR may be transmitted with the firstPUCCH resource. The base station device 3 may transmit the higher layersignaling including second information to be used to indicateperiodicity and/or offset for transmission of SR. The terminal device 1may transmit the SR in accordance with a configuration made by the basestation device 3. To be more specific, the terminal device 1 maytransmit the SR with the first PUCCH resource and/or the first PUCCHformat.

The base station device 3 may indicate the first PUCCH resource throughthe higher layer signaling and the PDCCH. For example, the base stationdevice 3 may transmit the higher layer signaling including thirdinformation to be used to configure the first PUCCH resource. Forexample, HARQ-ACK corresponding to the second PUCCH format may betransmitted with the first PUCCH resource. The terminal device 1 maydetermine the first PUCCH resource based on the Control Channel Element(CCE) used for the transmission of the PDCCH (e.g., the lowest index ofthe CCE) and the third information. The terminal device 1 may use thefirst PUCCH resource for the transmission of HARQ-ACK corresponding tothe second PUCCH format. To be more specific, the terminal device 1 maytransmit the HARQ-ACK with the first PUCCH resource and/or the secondPUCCH format.

The base station device 3 may transmit the higher layer signalingincluding fourth information to be used to configure the second PUCCHresource. For example, the CSI (e.g., periodic CSI) may be transmittedwith the second PUCCH resource. Here, the second PUCCH resource may beconfigured for each of the serving cells. In other words, the CSI may bereported for each serving cell. The base station device 3 may transmitthe higher layer signaling including fifth information to be used toindicate periodicity and/or offset for a periodic CSI report. Here, thefifth information may be information for each CSI process, for eachsubframe set and/or for each serving cell. The terminal device 1 mayperiodically report the CSI in accordance with a configuration made bythe base station device 3. To be more specific, the terminal device 1may report the periodic CSI with the second PUCCH resource and/or thethird PUCCH format.

The base station device 3 may indicate the third PUCCH resource throughthe higher layer signaling and the PDCCH (or downlink controlinformation transmitted on the PDCCH). For example, the CSI, SR, and/orHARQ-ACK corresponding to the fourth PUCCH format may be transmittedwith the third PUCCH resource. For example, the base station device 3may transmit through the higher layer signaling sixth information forconfiguring multiple values associated with the third PUCCH resource,and further, may indicate the third resource by indicating one valueamong the multiple values based on a value (also referred to as 1^(st)ACK Resource Indicator: 1^(st) ARI) set in a field of the downlinkcontrol information transmitted on the PDCCH.

For example, the base station device 3 may transmit through the higherlayer signaling the sixth information for configuring four valuescorresponding to four third PUCCH resources. Further, based on thevalues (e.g., “00”, “01”, “10”, or “11” set in a field of 2-bitinformation) set in the field of the downlink control informationtransmitted on the PDCCH, by indicating one value among the four values,the base station device 3 may indicate a single third resourcecorresponding to the one value. In other words, the terminal device 1may determine, based on one value corresponding to the value set in thefield of the downlink control information, a single third PUCCH resourcecorresponding to the one value from four values corresponding to fourthird PUCCH resources.

For example, the base station device 3 may indicate the third PUCCHresource based on a value set in a transmit power command field(hereinafter, also referred to as a TPC command field) for the PUCCHincluded in the downlink assignment for the secondary cell transmittedon the PDCCH. In other words, one value corresponding to a single thirdPUCCH resource may be indicated based on the value set in the TPCcommand field included in the downlink assignment used to indicatetransmission on the PDSCH in the secondary cell.

Here, the TPC command field included in the downlink assignment for theprimary cell (i.e., downlink assignment used to indicate transmission onthe PDSCH in the primary cell) may be used for a transmit power commandfor transmission on the PUCCH. The TPC command field included in thedownlink assignment for the PUCCH secondary cell (i.e., downlinkassignment used to indicate transmission on the PDSCH in the PUCCHsecondary cell can be used) may be used for a transmit power command fortransmission on the PUCCH.

The base station device 3 may indicate the fourth PUCCH resource throughthe higher layer signaling and the PDCCH (or downlink controlinformation transmitted on the PDCCH). For example, the CSI, SR, and/orHARQ-ACK corresponding to the fifth PUCCH format may be transmitted withthe fourth PUCCH resource.

For example, the terminal device 1 may report the CSI in a certainsubframe with the second PUCCH resource and/or the third PUCCH format.In other words, in the case that the CSI is reported by the terminaldevice 1 with the third PUCCH format, the second PUCCH resource is used.

Alternatively, the terminal device 1 may report the CSI in a certainsubframe with the third PUCCH resource and/or the fourth PUCCH format.In other words, in the case that the CSI is transmitted by the terminaldevice 1 with the fourth PUCCH format, the third PUCCH resource is used.

The terminal device 1 may transmit the CSI in a certain subframe withthe fourth PUCCH resource and/or the fifth PUCCH format. In other words,in the case that the CSI is transmitted by the terminal device 1 withthe fifth PUCCH format, the fourth PUCCH resource is used.

Here, for example, the terminal device 1 may use different PUCCH formatsand/or different PUCCH resources for the CSI reports corresponding torespective serving cells or some serving cells. Alternatively, theterminal device 1 may use different PUCCH formats and/or different PUCCHresources for the CSI reports corresponding to respective CSI processesor some CSI processes. Alternatively, the terminal device 1 may usedifferent PUCCH formats and/or different PUCCH resources for the CSIreports corresponding to respective subframe sets or some subframe sets.

Here, different PUCCH resources may be used for multiple CSI reportswith the same PUCCH format. For example, the second PUCCH resource usedfor a first CSI report with the third PUCCH format and the second PUCCHresource used for a second CSI report with the third PUCCH format may bedifferent resources from each other. For example, the second PUCCHresource used for the second CSI report may be a PUCCH resourceindicated by (configured with) a resource index different from aresource index for the second PUCCH resource used for the first CSIreport. Alternatively, the second PUCCH resource used for the second CSIreport may be a PUCCH resource indicated by (configured with) anorthogonal sequence index different from an orthogonal sequence indexfor the second PUCCH resource used for the first CSI report.Alternatively, the second PUCCH resource used for the second CSI reportmay be a PUCCH resource indicated by (configured with) a value of acyclic shift different from a cyclic shift for the second PUCCH resourceused for the first CSI report.

Here, the cell index includes a serving cell index (also referred to asServCellIndex) relating to identity used to identify the serving cell.

A serving cell index value “0” may apply to the primary cell. A servingcell index value applying to the secondary cell may be an assignedsecondary cell index value. The secondary cell index (ScellIndex) and/orthe serving cell index (ServCellIndex) is also referred to as a cellindex below.

Here, the base station device 3 may configure the cell index (cell indexvalue) for the terminal device 1. For example, the base station device 3may transmit the higher layer signaling that includes the cell index.The terminal device 1 may identify the cell index of the serving cellbased on the cell index configured by the base station device 3. Inother words, the cell index may be an index in the higher layer (alsoreferred to as an index in the RRC layer or an RRC index).

Hereinafter, operations in the terminal device 1 are basicallydescribed, but, of course, the base station device 3 performs theoperations corresponding to the terminal device 1. The operationsdescribed in the present embodiment may be performed for each cellgroup. To be more specific, the base station device 3 and/or theterminal device 1 may perform the operations described in the presentembodiment in one cell group.

For example, the operations described in the present embodiment may beapplicable to the case that the PUCCH format 3 is configured fortransmission of the uplink control information (e.g., transmission ofthe CSI report). The operations described in the present embodiment maybe applicable to the case that the PUCCH format 4 is configured fortransmission of the uplink control information (e.g., transmission ofthe CSI report).

The operations described in the present embodiment may be applicable tothe case that one serving cell is configured. The operations describedin the present embodiment may be applicable to the case that more thanone serving cell is configured. The operations described in the presentembodiment may be applicable to the case that more than five servingcells are configured. Here, the case that more than one serving isconfigured may be the case that more than one and up to five servingcells are configured.

Hereinafter, the periodic CSI reporting using the PUCCH according to thepresent embodiment will be described. However, multiple CSI subframesets may be configured in the uplink performing the CSI reporting.

The base station device 3 makes a configuration in order for theterminal device 1 to report the periodic CSI on the PUCCH in any ofreporting modes. The base station device 3 configures a reporting modeand a PUCCH resource used for periodic CSI reporting for each servingcell. The base station device 3 transmits information relating to theperiodic CSI reporting for each serving cell to the terminal device 1.

(A) For example, the terminal device 1 configured with reporting mode1-0 does not transmit a PMI. The terminal device 1 configured withreporting mode 1-0 does not transmit a subband CQI, but transmits awideband CQI.

(B) For example, the terminal device 1 configured with reporting mode1-1 transmits a PMI. The terminal device 1 configured with reportingmode 1-1 does not transmit a subband CQI, but transmits a wideband CQI.

(C) For example, the terminal device 1 configured with reporting mode2-0 does not transmit a PMI. The terminal device 1 configured withreporting mode 2-0 transmits a subband CQI and a wideband CQI.

(D) For example, the terminal device 1 configured with reporting mode2-1 transmits a PMI. The terminal device 1 configured with reportingmode 2-1 transmits a subband CQI and a wideband CQI.

The wideband CQI is calculated based on CRS and/or CSI-RS transmitted onall physical resource blocks in a certain subframe of a certain servingcell. The subband CQI is calculated based on CRS and/or CSI-RStransmitted on the physical resource blocks constituting a particularpart of the bandwidth in a certain subframe of a certain serving cell.

Each of the CSI reporting modes supports multiple reporting types.

(A) For example, reporting type 1 supports subband CQI feedback.

(B) For example, reporting type 1a supports subband CQI and PMIfeedback.

(C) For example, reporting type 2, reporting type 2a, and reporting type2b support wideband CQI and PMI feedback.

(D) For example, reporting type 3 supports RI feedback.

(E) For example, reporting type 4 supports wideband CQI feedback.

(F) For example, reporting type 5 supports RI and wideband PMI feedback.

(G) For example, reporting type 6 supports RI and PTI feedback.

In a case that a certain serving cell is configured with reporting mode1-0, the terminal device 1 reports the CSI of reporting type 3 andreporting type 4 corresponding to the serving cell to the base stationdevice 3. In a case that a certain serving cell is configured withreporting mode 1-1, the terminal device 1 reports the CSI of reportingtypes 2/2b/2c, reporting type 3 and reporting type 5 corresponding tothe serving cell to the base station device 3.

In a case that a certain serving cell is configured with reporting mode2-0, the terminal device 1 reports the CSI of reporting type 1,reporting type 3 and reporting type 4 corresponding to the serving cellto the base station device 3. In a case that a certain serving cell isconfigured with reporting mode 2-1, the terminal device 1 reports theCSI of reporting types 1/1a, reporting types 2/2a/2b, reporting type 3and reporting type 6 corresponding to the serving cell to the basestation device 3.

In a case that the terminal device 1 is configured in a transmissionmode (e.g., transmission mode 10) capable of configuring multiple CSIprocesses in a certain serving cell to report RI and/or PMI in a certainCSI process, the terminal device 1 may be configured with a RI-referenceCSI process for the CSI process. In a case that the terminal device 1 isconfigured with a RI-reference CSI process for a certain CSI process,the RI reported for the CSI process is the same as the RI included inthe most recent report of the channel state information including the RIfor the configured RI-reference CSI process. However, the RI reportedfor the RI-reference CSI process is not based on any other configuredCSI process. The terminal device 1 does not expect to receive anaperiodic CSI report request for triggering a CSI report including CSIassociated with a certain CSI process and not including CSI associatedwith the configured RI-reference CSI process in a certain subframe.

Hereinafter, reporting of the RI (also referred to as a periodic RI) inthe periodic CSI report according to the present embodiment will bedescribed.

The terminal device 1 determines the RI from the number of availabletransmission layers in spatial multiplexing. In a case of transmitdiversity, the RI is equal to one. The RI corresponds to transmission onthe Physical Downlink Shared CHannel (PDSCH) transmission, andcorresponds to the number of layers determined by the terminal device 1.

The terminal device 1 may be configured with one or multiple CSIprocesses by the higher layer. Each CSI process is configured with a CSIprocess index by the higher layer. For each CSI process, whether or notPMI and/or RI report is performed is configured by the higher layersignaling. The terminal device 1 determines one RI from the supportedset of RI values for each RI reporting interval and reports the numberof transmission layers in each RI report.

The terminal device 1 may be configured with one or multiple CSIsubframe sets (e.g., CSI subframe set 0 and CSI subframe set 1) by thehigher layer. For the terminal device 1 configured with multiplesubframe sets, a configuration of CQI or RI (e.g., a period for a reporttiming or offset can be used) may be made independently for eachsubframe set.

Hereinafter, RI and CQI reporting procedure in each reporting mode willbe described. The RI and the CQI will be described below, but other CSI(e.g., PMI, PTI, or the like) may be simultaneously reported in anyprocedure.

In a case of reporting mode 1-0, the RI and the CQI are calculated asbelow.

(RI in reporting mode 1-0) In the subframe where RI is reported, theterminal device 1 in the case of transmission mode 3 determines the RIassuming transmission on all frequency bands (sometimes referred to asset S subbands) possibly configured as a subband and reports the RI withreporting type 3.

(CQI in reporting mode 1-0) In the subframe where CQI is reported, theterminal device 1 reports the CQI with reporting type 4 constituted of asingle wideband CQI calculated assuming transmission on all frequencybands possibly configured as a subband. In this case, in the case oftransmission mode 3, the CQI is calculated based on the last reportedperiodic RI. In a case of other transmission modes, the CQI iscalculated conditioned on rank 1.

In a case of reporting mode 1-1, the RI and the CQI are calculated asbelow.

(RI in reporting mode 1-1) In the subframe where RI is reported, in acase that the terminal device 1 is configured in transmission mode 10with a RI-reference CSI process for a certain CSI process, the terminaldevice 1, regardless of the configuration of the subframe set, sets a RIfor the CSI process to the same value of the RI in the most recent CSIreport including a RI for the configured RI-reference CSI process. Inother cases, the terminal device 1 determines the RI assumingtransmission on all frequency bands possibly configured as a subband.The terminal device 1 reports the determined RI with reporting type 3(in a case without PMI) or reporting type 5 (in a case with PMI).

(CQI in reporting mode 1-1) In the subframe where CQI is reported, theterminal device 1 in the case of a prescribed transmission mode (e.g.,transmission mode 4, 8, 9, or 10) reports the CQI as below. In a casethat the terminal device 1 is configured in transmission mode 10 with aRI-reference CSI process for a certain CSI process, and the most recentreporting type 3 report for the CSI process is dropped, and the mostrecent reporting type 3 report is reported in the RI-reference CSIprocess for the CSI process, the CQI for the CSI process is calculatedbased on the periodic RI reported in the RI-reference CSI process. In acase that the terminal device 1 is configured in transmission mode 10with no RI-reference CSI process for a certain CSI process, the CQI forthe CSI process is calculated based on the last reported periodic RI forthe CSI process. In other cases, the CQI is calculated based on the lastreported periodic RI. The terminal device 1, in a case of othertransmission mode than a prescribed transmission mode (e.g.,transmission mode 4, 8, 9, or 10), calculates the CQI (and the PMI)conditioned on transmission rank 1.

FIG. 4 illustrates a case that the terminal device 1 configured intransmission mode 10 in a certain serving cell performs first RI reportand first CQI report for a first CSI process in the serving cell, andperforms second RI report and second CQI report for a second CSI processin the serving cell. Assume that the first CSI process as a RI-referenceCSI process is configured for the second CSI process. Here, a value ofthe second RI for the second CSI process reported in subframe number 3and subframe number 13 is the same value of a RI reported in subframenumber 2. Here, in a case that the second RI for the second CSI processreported in subframe number 23 is dropped depending on any conditiondescribed below, the second CQI for the second CSI process reported insubframe number 26 is calculated based on a RI for the first CSI processthat is a RI-reference CSI process reported in subframe number 22.

In a case of reporting mode 2-0, the RI and the CQI are calculated asbelow.

(RI in reporting mode 2-0) In the subframe where RI is reported, in thecase of transmission mode 3, the terminal device 1 determines the RIassuming transmission on the set S subbands and reports the RI withreporting type 3.

(Wideband CQI in reporting mode 2-0) In the subframe where wideband CQIis reported, the terminal device 1 reports the CSI with reporting type 4constituted of a single wideband CQI calculated assuming transmission onall frequency bands possibly configured as a subband. In this case, inthe case of transmission mode 3, the CQI is calculated based on the lastreported periodic RI. In the case of other transmission modes, the CQIcorresponding to reporting mode 2-0 is calculated conditioned on rank 1.

(Subband CQI in reporting mode 2-0) In the subframe where selectedsubband CQI is reported, the terminal device 1 reports a value of a CQIreflecting only transmission on the subband with reporting type 1. Thevalue of the CQI corresponding to reporting mode 2-0 represents onlychannel quality for a first codeword even in a case that the RI islarger than one. The terminal device 1 in the case of transmission mode3 calculates the subband selection and CQI values conditioned on thelast reported periodic RI, and in the case of other transmission modes,calculates subband selection and CQI values corresponding to reportingmode 2-0 conditioned on rank 1.

In a case of reporting mode 2-1, the RI and the CQI are calculated asbelow.

(RI in reporting mode 2-1) In the subframe where RI is reported, in acase that the terminal device 1 is configured in transmission mode 10with a RI-reference CSI process for a certain CSI process, the terminaldevice 1, regardless of the configuration of the subframe set, sets a RIfor the CSI process to the same value of the RI in the most recent CSIreport including a RI for the configured RI-reference CSI process. Inother cases, the terminal device 1 determines the RI assumingtransmission on all frequency bands possibly configured as a subband.The terminal device 1 reports the determined RI with reporting type 3(in a case without PTI) or reporting type 6 (in a case with PTI).

(Wideband CQI in reporting mode 2-1) In the subframe where wideband CQIis reported, the terminal device 1 in the case of a prescribedtransmission mode (e.g., transmission mode 4, 8, 9, or 10) reports thewideband CQI as below. In a case that the terminal device 1 isconfigured in transmission mode 10 with a RI-reference CSI process for acertain CSI process, and the most recent reporting type 3 report for theCSI process is dropped, and the most recent reporting type 3 report inthe RI-reference CSI process for the CSI process is reported, the CQIfor the CSI process is calculated based on the periodic RI reported inthe RI-reference CSI process. In other cases, the CQI is calculatedbased on the last reported periodic RI for the CSI process. The terminaldevice 1, in a case of other transmission mode than a prescribedtransmission mode (e.g., transmission mode 4, 8, 9, or 10), calculatesthe wideband CQI in reporting mode 2-1 conditioned on transmission rank1.

(Subband CQI in reporting mode 2-1) In the subframe where selectedsubband CQI is reported, the terminal device 1 reports a value of a CQIfor the first codeword reflecting only transmission on the subband withreporting type 1. In this case, in a case that the RI is larger thanone, the terminal device 1 reports a difference between a subband CQIindex for a second codeword and a subband CQI index for the firstcodeword with adding 3 bits to subband CQI. The terminal device 1 in thecase of a prescribed transmission mode (e.g., transmission mode 4, 8, 9,or 10) reports the subband CQI as below. In a case that the terminaldevice 1 is configured in transmission mode 10 with a RI-reference CSIprocess for a certain CSI process, and the most recent reporting type 3report for the CSI process is dropped, and the most recent reportingtype 3 report is reported in the RI-reference CSI process for the CSIprocess, subband selection and CQI values for the CSI process iscalculated based on the periodic RI reported in the RI-reference CSIprocess. In other cases, the subband selection and CQI values for theCSI process are calculated based on the last reported periodic RI. Theterminal device 1, in a case of other transmission mode than aprescribed transmission mode (e.g., transmission mode 4, 8, 9, or 10),calculates the subband selection and CQI values conditioned ontransmission rank 1.

Hereinafter, operations for simultaneously reporting one or multiple RIsaccording to the present embodiment will be described.

The terminal device 1 may be configured with the PUCCH format for RIreport in each configured serving cell. For example, the terminal device1 may be configured with an available PUCCH format among the third PUCCHformat, the fourth PUCCH format, and the fifth PUCCH format for RIreport in each configured serving cell.

The terminal device 1 may be configured with the PUCCH format for RIreport for each configured subframe set. For example, the terminaldevice 1 may be configured with an available PUCCH format among thethird PUCCH format, the fourth PUCCH format, and the fifth PUCCH formatfor RI report in each configured subframe set.

The terminal device 1 may be configured with the PUCCH format for RIreport in each configured CSI process. For example, the terminal device1 may be configured with an available PUCCH format among the third PUCCHformat, the fourth PUCCH format, and the fifth PUCCH format for RIreport in each configured CSI process.

A configuration may be made in common in all the serving cells ofwhether or not a format capable of simultaneously reporting multipleCSIs (e.g., the fifth PUCCH format) can be used for the terminal device1. A configuration may be made in common in all the subframe sets ofwhether or not a format capable of simultaneously reporting multipleCSIs (e.g., the fifth PUCCH format) can be used for the terminal device1. A configuration may be made in common in all the CSI processes ofwhether or not a format capable of simultaneously reporting multipleCSIs (e.g., the fifth PUCCH format) can be used for the terminal device1.

A configuration may be made of whether or not a format capable ofsimultaneously reporting multiple CSIs is applicable to the systemmanaging the terminal device 1, or a format capable of simultaneouslyreporting multiple CSIs may be configured for the terminal device 1through the higher layer signaling.

In a case that a certain PUCCH (assuming a first PUCCH) is configuredwith a PUCCH format capable of reporting only one CSI (e.g., the thirdPUCCH format), another certain PUCCH (assuming a second PUCCH) isconfigured with a format capable of simultaneously reporting multipleCSIs (e.g., the fifth PUCCH format), and the first PUCCH collides withthe second PUCCH, the CSI to be reported on the first PUCCH and the CSIto be reported on the second PUCCH may be processed to be simultaneouslyreported on the second PUCCH.

In other words, in a case that transmission on the first PUCCH resourceused to report one CSI in the third PUCCH format collides withtransmission on the second PUCCH resource used to simultaneously reportmultiple CSIs in the fifth PUCCH format, some or all of the one CSIand/or the multiple CSIs may be reported on the second PUCCH resource.To be more specific, in a case that one CSI reporting using the thirdPUCCH format and/or the first PUCCH resource collides with multiple CSIreports using the fifth PUCCH format and/or the second PUCCH resource,some or all of the one CSI and/or the multiple CSIs may be reportedusing the fifth PUCCH format and/or the second PUCCH resource.

Here, for example, the first PUCCH may be a PUCCH used for CSI reportfor the second CSI process in a certain serving cell (a first servingcell), and the second PUCCH may be a PUCCH used for CSI report inanother serving cell (a second serving cell). In other words, in a casethat a first CSI for the first CSI process in the first serving cell isreported on a PUCCH using any PUCCH format, a second CSI for the secondCSI process in the first serving cell is reported on a PUCCH using thethird PUCCH format, a CSI for the second serving cell is reported on aPUCCH using the fifth PUCCH format, and the second CSI report collideswith the CSI report for the second serving cell in a certain subframe,the terminal device 1 may report the second CSI and the CSI for thesecond serving cell colliding with each other on the PUCCH using thefifth PUCCH format.

Moreover, for example, the first PUCCH may be a PUCCH used for CSIreport for a second subframe set in a certain serving cell (the firstserving cell), and the second PUCCH may be a PUCCH used for CSIreporting in another serving cell (the second serving cell). In otherwords, in a case that a first CSI for a first subframe set in the firstserving cell is reported on a PUCCH using any PUCCH format, a second CSIfor the second subframe set in the first serving cell is reported on aPUCCH using the third PUCCH format, a CSI for the second serving cell isreported on a PUCCH using the fifth PUCCH format, and the second CSIreport collides with the CSI report for the second serving cell in acertain subframe, the terminal device 1 may report the second CSI andthe CSI for the second serving cell colliding with each other on thePUCCH using the fifth PUCCH format.

However, in a case that the first PUCCH is configured with a formatcapable of simultaneously reporting multiple CSIs (e.g., the fifth PUCCHformat), the second PUCCH is configured with a format capable ofsimultaneously reporting multiple CSIs (e.g., the fifth PUCCH format),and the first PUCCH collides with the second PUCCH, the CSI reported onthe first PUCCH and the CSI reported on the second PUCCH may beprocessed to be simultaneously reported on any one of the first PUCCHand the second PUCCH.

In other words, in a case that transmission on the first PUCCH resourceused to simultaneously report the first multiple CSIs and using thefifth PUCCH format collides with transmission on the second PUCCHresource used to simultaneously report the second multiple CSIs andusing the fifth PUCCH format, some or all of the first multiple CSIsand/or the second multiple CSIs may be reported on the first PUCCHresource or the second PUCCH resource. In other words, in a case thatthe first multiple CSI reports using the fifth PUCCH format and/or thefirst PUCCH resource collides with the second multiple CSI reports usingthe fifth PUCCH format and/or the second PUCCH resource, some or all ofthe first multiple CSIs and/or the second multiple CSIs may be reportedusing the first PUCCH resource and/or the second PUCCH resource. Here,some or all of the first multiple CSIs and/or the second multiple CSIsmay be reported with the fifth PUCCH format.

Here, for example, the first PUCCH may be a PUCCH used for CSI reportfor the second CSI process in a certain serving cell (a first servingcell), and the second PUCCH may be a PUCCH used for CSI report inanother serving cell (a second serving cell). In other words, in a casethat the first CSI for the first CSI process in the first serving cellis reported on a PUCCH using any PUCCH format, the second CSI for thesecond CSI process in the first serving cell is reported on a PUCCHusing the fifth PUCCH format, the CSI for the second serving cell isreported on a PUCCH using the fifth PUCCH format, and the second CSIreport collides with the CSI report for the second serving cell in acertain subframe, the terminal device 1 may report the second CSI andthe CSI for the second serving cell colliding with each other on thePUCCH using the fifth PUCCH format.

Moreover, for example, the first PUCCH may be a PUCCH used for CSIreport for a second subframe set in a certain serving cell (the firstserving cell), and the second PUCCH may be a PUCCH used for CSIreporting in another serving cell (the second serving cell). In otherwords, in a case that the first CSI for the first subframe set in thefirst serving cell is reported on a PUCCH using any PUCCH format, thesecond CSI for the second subframe set in the first serving cell isreported on a PUCCH using the fifth PUCCH format, the CSI for the secondserving cell is reported on a PUCCH using the fifth PUCCH format, andthe second CSI report collides with the CSI report for the secondserving cell in a certain subframe, the terminal device 1 may report thesecond CSI and the CSI for the second serving cell colliding with eachother on the PUCCH using the fifth PUCCH format.

However, in a case that the first PUCCH is configured with a PUCCHformat capable of reporting only one CSI (e.g., the third PUCCH format),the second PUCCH is configured with a PUCCH format capable of reportingonly one CSI (e.g., the third PUCCH format), and the first PUCCHcollides with the second PUCCH, any one of the CSI report reported onthe first PUCCH and the CSI report reported on the second PUCCH may beprocessed to be dropped.

Here, for example, the first PUCCH may be a PUCCH used for CSI reportfor the second CSI process in a certain serving cell (a first servingcell), and the second PUCCH may be a PUCCH used for CSI report inanother serving cell (a second serving cell). In other words, in a casethat the first CSI for the first CSI process in the first serving cellis reported on a PUCCH using any PUCCH format, the second CSI for thesecond CSI process in the first serving cell is reported on a PUCCHusing the third PUCCH format, the CSI for the second serving cell isreported on a PUCCH using the third PUCCH format, and the second CSIreport collides with the CSI report for the second serving cell in acertain subframe, the terminal device 1 may drop any one of the secondCSI and the CSI for the second serving cell colliding with each other.

Moreover, for example, the first PUCCH may be a PUCCH used for CSIreport for a second subframe set in a certain serving cell (the firstserving cell), and the second PUCCH may be a PUCCH used for CSIreporting in another serving cell (the second serving cell). In otherwords, in a case that the first CSI for the first subframe set in thefirst serving cell is reported on a PUCCH using any PUCCH format, thesecond CSI for the second subframe set in the first serving cell isreported on a PUCCH using the third PUCCH format, the CSI for the secondserving cell is reported on a PUCCH using the third PUCCH format, andthe second CSI report collides with the CSI report for the secondserving cell in a certain subframe, the terminal device 1 may drop anyone of the second CSI and the CSI for the second serving cell collidingwith each other.

In this case, in a case that the first PUCCH is configured with a PUCCHformat capable of reporting only one CSI (e.g., the third PUCCH format),the second PUCCH is configured with a PUCCH format capable of reportingonly one CSI (e.g., the third PUCCH format), the terminal device 1 isconfigure with a format capable of simultaneously reporting multipleCSIs (e.g., the fifth PUCCH format), and the first PUCCH collides withthe second PUCCH, the CSI to be reported on the first PUCCH and the CSIto be reported on the second PUCCH may be processed to be simultaneouslyreported with the format capable of simultaneously reporting multipleCSIs.

In this case, in a case that the first PUCCH is configured with a PUCCHformat capable of reporting only one CSI (e.g., the third PUCCH format),the second PUCCH is configured with a PUCCH format capable of reportingonly one CSI (e.g., the third PUCCH format), the terminal device 1 isnot configured with a format capable of simultaneously reportingmultiple CSIs (e.g., the fifth PUCCH format), and the first PUCCHcollides with the second PUCCH, any one of the CSI report on the firstPUCCH and the CSI report on the second PUCCH may be processed to bedropped.

To be more specific, in a case that a first one CSI report with thethird PUCCH format and/or the first PUCCH resource collides with asecond one CSI report with the third PUCCH format and/or the secondPUCCH resource, the terminal device configured with the fifth PUCCHformat used to simultaneously report multiple CSIs (or configured totransmit the uplink control information with the fifth PUCCH format) mayreport some or all of the first one CSI and/or the second one CSI withthe fifth PUCCH format. Here, some or all of the first one CSI and/orthe second one CSI may be reported on the PUCCH resource using the fifthPUCCH format.

Here, for example, the first PUCCH may be a PUCCH used for CSI reportfor the second CSI process in a certain serving cell (a first servingcell), and the second PUCCH may be a PUCCH used for CSI report inanother serving cell (a second serving cell). In other words, in a casethat the first CSI for the first CSI process in the first serving cellis reported on a PUCCH using any PUCCH format, the second CSI for thesecond CSI process in the first serving cell is reported on a PUCCHusing the third PUCCH format, the CSI for the second serving cell isreported on a PUCCH using the third PUCCH format, and the second CSIreport collides with the CSI report for the second serving cell in acertain subframe, the terminal device 1 configured with the fifth PUCCHformat may report the second CSI and the CSI for the second serving cellcolliding with each other on the PUCCH using the fifth PUCCH format, andthe terminal device 1 not configured with the fifth PUCCH format maydrop any one of the second CSI and the CSI for the second serving cellcolliding with each other.

Moreover, for example, the first PUCCH may be a PUCCH used for CSIreport for a second subframe set in a certain serving cell (the firstserving cell), and the second PUCCH may be a PUCCH used for CSIreporting in another serving cell (the second serving cell). In otherwords, in a case that the first CSI for the first subframe set in thefirst serving cell is reported on a PUCCH using any PUCCH format, thesecond CSI for the second subframe set in the first serving cell isreported on a PUCCH using the third PUCCH format, the CSI for the secondserving cell is reported on a PUCCH using the third PUCCH format, andthe second CSI report collides with the CSI report for the secondserving cell in a certain subframe, the terminal device 1 configuredwith the fifth PUCCH format may report the second CSI and the CSI forthe second serving cell colliding with each other on the PUCCH using thefifth PUCCH format, and the terminal device 1 not configured with thefifth PUCCH format may drop any one of the second CSI and the CSI forthe second serving cell colliding with each other.

In a case that multiple CSI reports collide with each other in a certainsubframe and the terminal device 1 can simultaneously report all thecolliding CSIs with an applicable PUCCH format, the terminal device 1may not drop but report all the CSIs. In this case, in a case that theterminal device 1 is configured in a transmission mode capable ofconfiguring multiple CSI processes (e.g., transmission mode 10) in acertain serving cell, and a CSI associated with a certain CSI processcollides with a CSI associated with a RI-reference CSI process for thecertain CSI process in a certain serving cell, the terminal device 1 maydrop any one of the CSI reports. For example, the dropped CSI report maybe a CSI report associated with the certain CSI process configured witha RI-reference CSI process.

In other words, the terminal device 1 may report a CSI associated withthe first CSI process with one PUCCH (PUCCH resource) in one subframe.Moreover, the terminal device 1 may report a CSI associated with thesecond CSI process different from the first CSI process with one PUCCH(PUCCH resource) in one subframe. Here, a PUCCH format for reporting oneCSI may be used to report the CSI associated with the first CSI process.A PUCCH format for reporting one CSI may be used to report the CSIassociated with the second CSI process.

Here, in a case that the CSI report associated with the first CSIprocess collides with the CSI report associated with the second CSIprocess in one subframe, the terminal device 1 may report some or all ofthe CSI associated with the first CSI process and the CSI associatedwith the second CSI process in the one subframe with one PUCCH (PUCCHresource). Here, the first CSI process is not a RI-reference CSI processfor the second CSI process. A PUCCH format for simultaneously reportingmultiple CSIs may be used to report some or all of the CSI associatedwith the first CSI process and the CSI associated with the second CSIprocess.

In the case that the CSI report associated with the first CSI processcollides with the CSI report associated with the second CSI process inone subframe, the terminal device 1 may report any one of the CSIassociated with the first CSI process and the CSI associated with thesecond CSI process in the one subframe with one PUCCH (PUCCH resource).In other words, the terminal device 1 may drop the CSI report associatedwith the first CSI process, and report only the CSI associated with thesecond CSI process. Moreover, the terminal device 1 may drop the CSIreport associated with the second CSI process, and report only the CSIassociated with the first CSI process. Here, the first CSI process is aRI-reference CSI process for the second CSI process. A PUCCH format forsimultaneously reporting multiple CSIs may be used to report the CSIassociated with the first CSI process or the CSI associated with thesecond CSI process.

In other words, the terminal device 1 may switch, based on whether ornot the first CSI process is a RI-reference CSI process for the secondCSI process, between reporting both the CSI associated with the firstCSI process and the CSI associated with the second CSI process, anddropping (reporting) any one of the CSI associated with the first CSIprocess and the CSI associated with the second CSI process. Here, whichof the CSI associated with the first CSI process and the CSI associatedwith the second CSI process is dropped (a dropping rule, priority) isdescribed below.

FIG. 5 is a flow diagram illustrating one example of an operation of theterminal device 1 in a case that multiple PUCCHs each of which transmitsa CSI with a prescribed PUCCH format collide with each other. However,the fifth PUCCH format in the flow diagram may be any format capable ofsimultaneously reporting multiple CSIs.

At step S101, in a case that any of the colliding PUCCHs is configuredwith the fifth PUCCH format (S101—Yes), the procedure proceeds to stepS103, or in a case that it is not configured (S101—No), the procedureproceeds to step S102. At step S102, in a case that the terminal device1 is configured with the fifth PUCCH format (S102—Yes), the procedureproceeds to S103, or in a case that it is not configured (S102—No), theprocedure proceeds to step S104. At step S103, in a case that all thecolliding CSIs can be reported with the applicable fifth PUCCH format(S103—Yes), the procedure proceeds to step S105, or in a case that thosecannot be reported (S103—No), the procedure proceeds to step S104. Atstep S104, the terminal device 1 drops a CSI report having lowerpriority based on a prescribed rule described below until the CSIsbecomes able to be reported with the applicable PUCCH format. At stepS105, the terminal device 1 reports all the CSIs not dropped with theapplicable PUCCH format.

In a case that the terminal device 1 is configured in a transmissionmode capable of configuring multiple CSI processes (e.g., transmissionmode 10) in a certain serving cell, and a CSI report (or RI report)associated with a certain CSI process collides with a CSI report (or RIreport) associated with a CSI process configured with a RI-reference CSIprocess the same as for the certain CSI process in a certain subframe,the terminal device 1 may drop any one of the CSI reports as that havingthe lowest priority. For example, the dropped CSI report may be a CSIreport associated with the CSI process configured with a RI-referenceCSI process.

FIG. 6 is a diagram for describing one example of a dropping rule in acase that multiple CSI reports collide with each other. FIG. 6illustrates a case that the terminal device 1 configured in transmissionmode 10 in a certain serving cell reports a first RI report and a firstCQI report for a first CSI process in the serving cell, and reports asecond RI report and a second CQI report for a second CSI process in theserving cell. Here, assume that the first RI report for the first CSIprocess collides with the second RI report for the second CSI process insubframe number 2 and subframe number 22.

In a case that a PUCCH format capable of simultaneously reportingmultiple CSIs is not applicable to the first RI report and the second RIreport, the terminal device 1 drops any of the first RI report and thesecond RI report in subframe number 2 and subframe number 22. Thedropped RI report may be selected in accordance with a rule describedbelow.

In a case that a PUCCH format capable of simultaneously reportingmultiple CSIs is applicable to the first RI report and the second RIreport, the terminal device 1 may process the reporting as below. In thecase that the first CSI process is a RI-reference CSI process for thesecond CSI process, the terminal device 1 may drop the second RI reportcolliding with the first RI report. In this case, the second CQI for thesecond CSI process in subframe number 6 may be calculated based on thefirst RI for the first CSI process reported in subframe number 2, andthe second CQI for the second CSI process in subframe number 26 may becalculated based on the first RI for the first CSI process reported insubframe number 22. In a case that the first CSI process is not aRI-reference CSI process for the second CSI process, the terminal device1 may report both the first RI and the second RI with applying a PUCCHformat capable of simultaneously reporting multiple CSIs.

FIG. 7 is a flow diagram illustrating one example of an operation of theterminal device 1 in a case that multiple CSI reports collide with eachother in a state where a transmission mode capable of configuringmultiple CSI processes (e.g., transmission mode 10) is configured and aformat capable of simultaneously reporting multiple CSIs (e.g., thefifth PUCCH format) can be used. The operation of the flow diagram inFIG. 7 may be added immediately before step S103 in FIG. 5 (that is,between step S101—Yes and step S103 and/or between step S102—Yes andstep S103), for example. The first CSI report and second CSI report inFIG. 7 may be the first RI report and the second RI report,respectively.

At step S201, in a case that the first CSI report for the first CSIprocess collides with the second CSI report for the second CSI process(S201—Yes), the procedure proceeds to step S202, or in a case that bothdo not collide (S201—No), the operation is terminated. The first CSIreport and second CSI report at step S201 are preferably applied to allthe colliding CSI reports. At step S202, in a case that the first CSIprocess is a RI-reference CSI process for the second CSI process(S202—Yes), the procedure proceeds to step S203, or in a case that thefirst CSI process is not a RI-reference CSI process for the second CSIprocess (S202—No), the procedure proceeds to step S204. At step S203,the second CSI report for the second CSI process for which aRI-reference CSI process is configured for the first CSI process isdropped, and the operation is terminated. At step S204, the second CSIreport for the second CSI process is not dropped, and the operation isterminated.

In this way, even in a state where a format capable of simultaneouslyreporting multiple CSIs (e.g., the fifth PUCCH format) is usable, theCSI report for the CSI process for which a RI-reference CSI process isconfigured for another CSI process is dropped to allow the PUCCHresource used for reporting to be saved.

The above description illustrates the operation of dropping the CSIreport for the CSI process configured with a RI-reference CSI processcolliding with the CSI report for the referenced CSI process, but theterminal device 1 may operate to drop the CSI report for the CSI processfor which a RI-reference CSI process is configured for another CSIprocess colliding with any CSI report.

Hereinafter, a priority rule in the case that multiple CSI reportscollide with each other in the present embodiment will be described.

In a case that the CSI report with reporting type 3, 5, or 6 of acertain serving cell collides with the CSI report with reporting type 1,1a, 2, 2a, 2b, 2c, or 4 of the same serving cell, and all the collidingCSIs cannot simultaneously be reported with the applicable PUCCH format,the terminal device 1 sets the latter CSI report (with reporting type 1,1a, 2, 2a, 2b, 2c, or 4) as a CSI report with a reporting type of lowerpriority.

In a case that the terminal device 1 is configured in a transmissionmode capable of configuring multiple CSI processes (e.g., transmissionmode 10) in a certain serving cell, and multiple CSI reports with areporting type of the same priority and for different CSI processescollide with each other, and all the colliding CSIs cannot besimultaneously reported with the applicable PUCCH format, the terminaldevice 1 sets the CSI for the CSI process with a larger CSI processindex as a CSI report for a CSI process of lower priority.

In a case that the terminal device 1 is configured in a transmissionmode capable of configuring one CSI process (e.g., transmission modes 1to 9) in a certain serving cell, a CSI subframe set 0 and CSI subframeset 1 are configured by a higher layer parameter, the CSI reports with areporting type of the same priority in the same serving cell collidewith each other, and all the colliding CSIs cannot be simultaneouslyreported with the applicable PUCCH format, the terminal device 1 sets aCSI report for CSI subframe set 1 as a CSI report for a subframe set oflower priority.

In a case that the terminal device 1 is configured in a transmissionmode capable of configuring multiple CSI processes (e.g., transmissionmode 10) in a certain serving cell, CSI subframe set 0 and CSI subframeset 1 are configured by a higher layer parameter, the CSI reports of thesame serving cell with a reporting type of the same priority and indexedby the same CSI process index collide with each other, and all thecolliding CSIs cannot be simultaneously reported with the applicablePUCCH format, the terminal device 1 sets a CSI report for CSI subframeset 1 as a CSI report for a subframe set of lower priority.

In a case that the terminal device 1 is configured with multiple servingcell and a PUCCH format capable of reporting only a CSI for one servingcell is applied to the terminal device 1, the terminal device 1transmits a CSI report for only one serving cell per a subframe. In acase that in a certain subframe the CSI report with reporting type 3, 5,6, or 2a of a certain serving cell collides with the CSI report withreporting type 1, 1a, 2, 2b, 2c, or 4 of anther serving cell, and allthe colliding CSIs cannot be simultaneously reported with the applicablePUCCH format, the latter CSI report (with reporting type 1, 1a, 2, 2b,2c, or 4) is set as a CSI report with a reporting type of lowerpriority. In a case that in a certain subframe the CSI report withreporting type 2, 2b, 2c, or 4 of a certain serving cell collides withthe CSI report with reporting type 1 or 1a of anther serving cell, andall the colliding CSIs cannot be simultaneously reported with theapplicable PUCCH format, the latter CSI report (with reporting type 1 or1a) is set as a CSI report with a reporting type of lower priority.

In a case that the terminal device 1 is configured in a transmissionmode capable of configuring one CSI process (e.g., transmission modes 1to 9) in multiple serving cells in a certain subframe, the CSI reportsof different serving cells with a reporting type of the same prioritycollide with each other, and all the colliding CSIs cannot besimultaneously reported with the applicable PUCCH format, the terminaldevice 1 sets a CSI report for a serving cell with a larger cell indexconfigured by the higher layer as a CSI report for a serving cell oflower priority.

In a case that the terminal device 1 is configured in a transmissionmode capable of configuring multiple CSI processes (e.g., transmissionmode 10) in multiple serving cells in a certain subframe, the CSIreports of different serving cells with a reporting type of the samepriority and with the same CSI process index collide with each other,and all the colliding CSIs cannot be simultaneously reported with theapplicable PUCCH format, the terminal device 1 sets a CSI report for aserving cell with a larger cell index configured by the higher layer asa CSI report for a serving cell of lower priority.

In the case that the terminal device 1 is configured in a transmissionmode capable of configuring multiple CSI processes (e.g., transmissionmode 10) in multiple serving cells in a certain subframe, the CSIreports of different serving cells with a reporting type of the samepriority and with different CSI process indexes collide with each other,and all the colliding CSIs cannot be simultaneously reported with theapplicable PUCCH format, the terminal device 1 sets a CSI report for aserving cell involving a CSI for a CSI process with a larger CSI processindex as a CSI report for a serving cell of lower priority.

In a case that in a certain subframe the CSI report of the serving cellconfigured with a transmission mode capable of configuring one CSIprocess (e.g., transmission modes 1 to 9) collides with the CSI reportsof different serving cells configured with a transmission mode capableof configuring multiple CSI processes (e.g., transmission mode 10), theCSI reporting type priorities for these serving cells are identical, andall the colliding CSIs cannot be simultaneously reported with theapplicable PUCCH format, the terminal device 1 sets, for a CSI reportwith a CSI process index larger than one for the latter serving cell, aCSI report for a CSI process with a larger CSI process index as a CSIreport for a CSI process of lower priority.

In the case that in a certain subframe the CSI report of the servingcell configured with a transmission mode capable of configuring one CSIprocess (e.g., transmission modes 1 to 9) collides with the CSI reportfor a CSI process of different serving cell configured with atransmission mode capable of configuring multiple CSI processes (e.g.,transmission mode 10), a CSI process index of the CSI process being one,and the CSI reporting type priorities for these serving cells areidentical, the terminal device 1 sets a CSI report for a serving cellwith a larger cell index configured by the higher layer as a CSI reportfor serving cell of lower priority.

In a case that multiple CSI reports collide with each other and all thecolliding CSIs cannot be simultaneously reported with the applied PUCCHformat, the terminal device 1 drops the CSI report with lower priorityin accordance with the rule described above. As the CSI report withlower priority is dropped, at a point of time when the rest of CSIreports that are not dropped becomes able to be simultaneously reportedwith the applied PUCCH format, the dropping process may be terminated toperform the CSI reporting process.

However, as described above, in a case that at least some of thecolliding multiple CSI reports include the CSI report for the CSIprocess configured with a RI-reference CSI process and the CSI reportfor the referenced CSI process, the CSI report for the CSI processconfigured with a RI-reference CSI process may be dropped regardless ofwhether or not the CSIs can be simultaneously reported with the appliedPUCCH format.

The method/process relating to the transmission of the uplink controlinformation have been described above referring to the drawings, but thespecific configuration is not limited to the above description andincludes an amendment to a design or the like that falls within thescope not departing from the gist of the present invention. Furthermore,as for the present embodiment, embodiments that are made by suitablycombining the method/process described above are also included in thetechnical scope of the present invention.

A configuration of devices according to the present embodiment will bedescribed below.

FIG. 8 is a schematic block diagram illustrating a configuration of theterminal device 1 according to the present embodiment. As illustrated inFIG. 8, the terminal device 1 is configured to include a higher layerprocessing unit 101, a control unit 103, a reception unit 105, atransmission unit 107, and a transmit and receive antenna 109.Furthermore, the higher layer processing unit 101 is configured toinclude a radio resource control unit 1011, a scheduling informationinterpretation unit 1013, and a channel state information (CSI) reportcontrol unit 1015. Furthermore, the reception unit 105 is configured toinclude a decoding unit 1051, a demodulation unit 1053, a demultiplexingunit 1055, a radio reception unit 1057, and a measurement unit 1059. Thetransmission unit 107 is configured to include a coding unit 1071, amodulation unit 1073, a multiplexing unit 1075, a radio transmissionunit 1077, and an uplink reference signal generation unit 1079.

The higher layer processing unit 101 outputs the uplink data (thetransport block) generated by a user operation or the like, to thetransmission unit 107. The higher layer processing unit 101 performsprocessing of the Medium Access Control (MAC) layer, the Packet DataConvergence Protocol (PDCP) layer, the Radio Link Control (RLC) layer,and the Radio Resource Control (RRC) layer.

The radio resource control unit 1011 included in the higher layerprocessing unit 101 manages various pieces of configuration informationof the terminal device 1 itself. Furthermore, the radio resource controlunit 1011 generates information to be mapped to each uplink channel, andoutputs the generated information to the transmission unit 107.

The scheduling information interpretation unit 1013 included in thehigher layer processing unit 101 interprets the DCI format (schedulinginformation) received through the reception unit 105, generates controlinformation for control of the reception unit 105 and the transmissionunit 107, in accordance with a result of interpreting the DCI format,and outputs the generated control information to the control unit 103.

The CSI report control unit 1015 instructs the measurement unit 1059 toderive the channel state information (RI/PMI/CQI) relating to the CSIreference resource. The CSI report control unit 1015 instructs thetransmission unit 107 to transmit the RI/PMI/CQI. The CSI report controlunit 1015 sets a configuration that is used when the measurement unit1059 calculates the CQI.

Based on the control information originating from the higher layerprocessing unit 101, the control unit 103 generates a control signal forcontrolling of the reception unit 105 and the transmission unit 107. Thecontrol unit 103 outputs the generated control signal to the receptionunit 105 and the transmission unit 107 to control the reception unit 105and the transmission unit 107.

In accordance with the control signal input from the control unit 103,the reception unit 105 demultiplexes, demodulates, and decodes areception signal received from the base station device 3 through thetransmit and receive antenna 109, and outputs the decoded information tothe higher layer processing unit 101.

The radio reception unit 1057 converts (down-converts) a downlink signalreceived through the transmit and receive antenna 109 into a signal ofan intermediate frequency, removes unnecessary frequency components,controls an amplification level in such a manner as to suitably maintaina signal level, performs orthogonal demodulation based on an in-phasecomponent and an orthogonal component of the received signal, andconverts the resulting orthogonally-demodulated analog signal into adigital signal. The radio reception unit 1057 removes a portioncorresponding to a Guard Interval (GI) from the digital signal resultingfrom the conversion, performs Fast Fourier Transform (FFT) on the signalfrom which the guard interval has been removed, and extracts a signal inthe frequency domain.

The demultiplexing unit 1055 demultiplexes the extracted signal into thePHICH, the PDCCH, the EPDCCH, the PDSCH, and the downlink referencesignal. Furthermore, the demultiplexing unit 1055 makes a compensationof channels including the PHICH, the PDCCH, the EPDCCH, and the PDSCH,from a channel estimate input from the measurement unit 1059.Furthermore, the demultiplexing unit 1055 outputs the downlink referencesignal resulting from the demultiplexing, to the measurement unit 1059.

The demodulation unit 1053 multiplies the PHICH by a corresponding codefor composition, demodulates the resulting composite signal incompliance with a binary phase shift keying (BPSK) modulation scheme,and outputs a result of the demodulation to the decoding unit 1051. Thedecoding unit 1051 decodes the PHICH destined for the terminal device 1itself and outputs the HARQ indicator resulting from the decoding to thehigher layer processing unit 101. The demodulation unit 1053 demodulatesthe PDCCH and/or the EPDCCH in compliance with a QPSK modulation schemeand outputs a result of the demodulation to the decoding unit 1051. Thedecoding unit 1051 attempts to decode the PDCCH and/or the EPDCCH. In acase of succeeding in the decoding, the decoding unit 1051 outputsdownlink control information resulting from the decoding and an RNTI towhich the downlink control information corresponds, to the higher layerprocessing unit 101.

The demodulation unit 1053 demodulates the PDSCH in compliance with amodulation scheme notified with the downlink grant, such as QuadraturePhase Shift Keying (QPSK), 16 Quadrature Amplitude Modulation (QAM), or64 QAM, and outputs a result of the demodulation to the decoding unit1051. The decoding unit 1051 decodes the data in accordance withinformation on a coding rate notified with the downlink controlinformation, and outputs, to the higher layer processing unit 101, thedownlink data (the transport block) resulting from the decoding.

The measurement unit 1059 performs downlink path loss measurement,channel measurement, and/or interference measurement from the downlinkreference signal input from the demultiplexing unit 1055. Themeasurement unit 1059 outputs the CSI calculated based on a result ofthe measurement and the result of the measurement to the higher layerprocessing unit 101. Furthermore, the measurement unit 1059 calculates adownlink channel estimate from the downlink reference signal and outputsthe calculated downlink channel estimate to the demultiplexing unit1055.

The transmission unit 107 generates the uplink reference signal inaccordance with the control signal input from the control unit 103,codes and modulates the uplink data (the transport block) input from thehigher layer processing unit 101, multiplexes the PUCCH, the PUSCH, andthe generated uplink reference signal, and transmits a result of themultiplexing to the base station device 3 through the transmit andreceive antenna 109.

The coding unit 1071 codes the uplink control information and uplinkdata input from the higher layer processing unit 101. The modulationunit 1073 modulates coded bits input from the coding unit 1071, incompliance with the modulation scheme such as BPSK, QPSK, 16 QAM, or 64QAM.

The uplink reference signal generation unit 1079 generates a sequenceacquired according to a rule (formula) prescribed in advance, based on aphysical cell identifier (also referred to as a physical cell identity(PC), a Cell ID, or the like) for identifying the base station device 3,a bandwidth to which the uplink reference signal is mapped, a cyclicshift notified with the uplink grant, a parameter value for generationof a DMRS sequence, and the like.

Based on the information used for the scheduling of the PUSCH, themultiplexing unit 1075 determines the number of PUSCH layers to bespatial-multiplexed, maps multiple pieces of uplink data transmitted onthe same PUSCH to multiple layers through Multiple Input Multiple OutputSpatial Multiplexing (MIMO SM), and performs precoding on the layers.

In accordance with the control signal input from the control unit 103,the multiplexing unit 1075 performs Discrete Fourier Transform (DFT) onmodulation symbols of the PUSCH. Furthermore, the multiplexing unit 1075multiplexes PUCCH and PUSCH signals and the generated uplink referencesignal for each transmit antenna port. To be more specific, themultiplexing unit 1075 maps the PUCCH and PUSCH signals and thegenerated uplink reference signal to the resource elements for eachtransmit antenna port.

The radio transmission unit 1077 performs Inverse Fast Fourier Transform(IFFT) on a signal resulting from the multiplexing, performs modulationin compliance with an SC-FDMA scheme, attaches the guard interval to theSC-FDMA-modulated SC-FDMA symbol, generates a baseband digital signal,converts the baseband digital signal into an analog signal, generates anin-phase component and an orthogonal component of an intermediatefrequency from the analog signal, removes frequency componentsunnecessary for the intermediate frequency band, converts (up-converts)the signal of the intermediate frequency into a signal of a highfrequency, removes unnecessary frequency components, performs poweramplification, and outputs a final result to the transmit and receiveantenna 109 for transmission.

FIG. 9 is a schematic block diagram illustrating a configuration of thebase station device 3 according to the present embodiment. As isillustrated, the base station device 3 is configured to include a higherlayer processing unit 301, a control unit 303, a reception unit 305, atransmission unit 307, and a transmit and receive antenna 309. Thehigher layer processing unit 301 is configured to include a radioresource control unit 3011, a scheduling unit 3013, and a CSI reportcontrol unit 3015. The reception unit 305 is configured to include adecoding unit 3051, a demodulation unit 3053, a demultiplexing unit3055, a radio reception unit 3057, and a measurement unit 3059. Thetransmission unit 307 is configured to include a coding unit 3071, amodulation unit 3073, a multiplexing unit 3075, a radio transmissionunit 3077, and a downlink reference signal generation unit 3079.

The higher layer processing unit 301 performs processing of the MediumAccess Control (MAC) layer, the Packet Data Convergence Protocol (PDCP)layer, the Radio Link Control (RLC) layer, and the Radio ResourceControl (RRC) layer. Furthermore, the higher layer processing unit 301generates control information for control of the reception unit 305 andthe transmission unit 307, and outputs the generated control informationto the control unit 303.

The radio resource control unit 3011 included in the higher layerprocessing unit 301 generates, or acquires from a higher node, thedownlink data (the transport block) arranged in the downlink PDSCH,system information, the RRC message, the MAC Control Element (CE), andthe like, and outputs a result of the generation or the acquirement tothe transmission unit 307. Furthermore, the radio resource control unit3011 manages various pieces of configuration information on each of theterminal devices 1.

The scheduling unit 3013 included in the higher layer processing unit301 determines a frequency and a subframe to which the physical channels(the PDSCH and the PUSCH) are allocated, the coding rate and modulationscheme for the physical channels (the PDSCH and the PUSCH), the transmitpower, and the like, from the received CSI and from the channelestimate, channel quality, or the like input from the measurement unit3059. The scheduling unit 3013 generates the control information inorder to control the reception unit 305 and the transmission unit 307 inaccordance with a result of the scheduling, and outputs the generatedinformation to the control unit 303. The scheduling unit 3013 generatesthe information (e.g., the DCI format) to be used for the scheduling ofthe physical channels (the PDSCH and the PUSCH), based on the result ofthe scheduling.

The CSI report control unit 3015 included in the higher layer processingunit 301 controls a CSI report that is made by the terminal device 1.The CSI report control unit 3015 transmits information that is assumedin order for the terminal device 1 to derive a RI/PMI/CQI in the CSIreference resource and that indicates various configurations, to theterminal device 1 through the transmission unit 307.

Based on the control information originating from the higher layerprocessing unit 301, the control unit 303 generates a control signal forcontrolling the reception unit 305 and the transmission unit 307. Thecontrol unit 303 outputs the generated control signal to the receptionunit 305 and the transmission unit 307 to control the reception unit 305and the transmission unit 307.

In accordance with the control signal input from the control unit 303,the reception unit 305 demultiplexes, demodulates, and decodes thereception signal received from the terminal device 1 through thetransmit and receive antenna 309, and outputs information resulting fromthe decoding to the higher layer processing unit 301. The radioreception unit 3057 converts (down-converts) an uplink signal receivedthrough the transmit and receive antenna 309 into a signal of anintermediate frequency, removes unnecessary frequency components,controls the amplification level in such a manner as to suitablymaintain a signal level, performs orthogonal demodulation based on anin-phase component and an orthogonal component of the received signal,and converts the resulting orthogonally-demodulated analog signal into adigital signal.

The radio reception unit 3057 removes a portion corresponding to theGuard Interval (GI) from the digital signal resulting from theconversion. The radio reception unit 3057 performs Fast FourierTransform (FFT) on the signal from which the guard interval has beenremoved, extracts a signal in the frequency domain, and outputs theresulting signal to the demultiplexing unit 3055.

The demultiplexing unit 1055 demultiplexes the signal input from theradio reception unit 3057 into the PUCCH, the PUSCH, and the signal suchas the uplink reference signal. The demultiplexing is performed based onradio resource allocation information that is determined in advance bythe base station device 3 using the radio resource control unit 3011 andthat is included in the uplink grant notified to each of the terminaldevices 1. Furthermore, the demultiplexing unit 3055 makes acompensation of channels including the PUCCH and the PUSCH from thechannel estimate input from the measurement unit 3059. Furthermore, thedemultiplexing unit 3055 outputs an uplink reference signal resultingfrom the demultiplexing, to the measurement unit 3059.

The demodulation unit 3053 performs Inverse Discrete Fourier Transform(IDFT) on the PUSCH, acquires modulation symbols, and performs receptionsignal demodulation, that is, demodulates each of the modulation symbolson the PUCCH and the PUSCH, in compliance with the modulation schemeprescribed in advance, such as Binary Phase Shift Keying (BPSK), QPSK,16 QAM, or 64 QAM, or in compliance with the modulation scheme that thebase station device 3 itself notifies in advance each of the terminaldevices 1 with the uplink grant. The demodulation unit 3053demultiplexes the modulation symbols of multiple pieces of uplink datatransmitted on the same PUSCH with the MIMO SM, based on the number ofspatial-multiplexed sequences notified in advance with the uplink grantto each of the terminal devices 1 and information indicating theprecoding to be performed on the sequences.

The decoding unit 3051 decodes coded bits of the PUCCH and the PUSCH,which have been demodulated, at the coding rate in compliance with acoding scheme prescribed in advance, the coding rate being prescribed inadvance or being notified in advance with the uplink grant to theterminal device 1 by the base station device 3 itself, and outputs thedecoded uplink data and uplink control information to the higher layerprocessing unit 101. In a case that the PUSCH is re-transmitted, thedecoding unit 3051 performs the decoding with the coded bits input fromthe higher layer processing unit 301 and retained in an HARQ buffer, andthe demodulated coded bits. The measurement unit 309 measures thechannel estimate, the channel quality, and the like, based on the uplinkreference signal input from the demultiplexing unit 3055, and outputs aresult of the measurement to the demultiplexing unit 3055 and the higherlayer processing unit 301.

The transmission unit 307 generates the downlink reference signal inaccordance with the control signal input from the control unit 303,codes and modulates the HARQ indicator, the downlink controlinformation, and the downlink data that are input from the higher layerprocessing unit 301, multiplexes the PHICH, the PDCCH, the EPDCCH, thePDSCH, and the downlink reference signal, and transmits a result of themultiplexing to the terminal device 1 through the transmit and receiveantenna 309.

The coding unit 3071 codes the HARQ indicator, the downlink controlinformation, and the downlink data input from the higher layerprocessing unit 301. The modulation unit 3073 modulates the coded bitsinput from the coding unit 3071, in compliance with the modulationscheme such as BPSK, QPSK, 16 QAM, or 64 QAM.

The downlink reference signal generation unit 3079 generates, as thedownlink reference signal, a sequence that is already known to theterminal device 1 and that is acquired in accordance with a ruleprescribed in advance based on the physical cell identifier (PCI) foridentifying the base station device 3, and the like.

Depending on the number of PDSCH layers to be spatial-multiplexed, themultiplexing unit 3075 maps one or multiple pieces of downlink datatransmitted on one PUSCH to one or multiple layers, and performsprecoding on the one or multiple layers. The multiplexing unit 375multiplexes the signal on the downlink physical channel and the downlinkreference signal for each transmit antenna port. The multiplexing unit375 maps the signal on the downlink physical channel and the downlinkreference signal to the resource elements for each transmit antennaport.

The radio transmission unit 3077 performs Inverse Fast Fourier Transform(IFFT) on the modulation symbol resulting from the multiplexing or thelike, performs the modulation in compliance with an OFDM scheme togenerate an OFDM symbol, attaches the guard interval to theOFDM-modulated OFDM symbol, generates a digital signal in a baseband,converts the digital signal in the baseband into an analog signal,generates an in-phase component and an orthogonal component of anintermediate frequency from the analog signal, removes frequencycomponents unnecessary for the intermediate frequency band, converts(up-converts) the signal of the intermediate frequency into a signal ofa high frequency signal, removes unnecessary frequency components,performs power amplification, and outputs a final result to the transmitand receive antenna 309 for transmission.

(1) To be more specific, the terminal device 1 in a first aspect of thepresent invention may be a terminal device 1 including a transmissionunit 107 which reports a first rank indicator (RI) for a first channelstate information (CSI) process and reports a second RI for a second CSIprocess, and in a case that in a certain subframe, the first RI reportcollides with the second RI report, and the first RI and the second RIare reported on an identical physical uplink control channel with afirst format, and the first CSI process is not a RI-reference CSIprocess for the second CSI process, the first RI and the second RI maybe reported, and in a case that in a certain subframe, the first RIreport collides with the second RI report, and the first RI and thesecond RI are reported on an identical physical uplink control channelwith the first format, and the first CSI process is a RI-reference CSIprocess for the second CSI process, any of the first RI report and thesecond RI report may be dropped.

(2) In the above first aspect, in a case that in a certain subframe, thefirst RI report on the physical uplink control channel with the firstformat collides with the second RI report on the physical uplink controlchannel with the first format, the first RI and the second RI may bereported on an identical physical uplink control channel with the firstformat, and in a case that in a certain subframe, the first RI report onthe physical uplink control channel with the first format collides withthe second RI report on the physical uplink control channel with thesecond format, the first RI and the second RI may be reported on anidentical physical uplink control channel with the first format, and ina case that in a certain subframe, the first RI report on the physicaluplink control channel with the second format collides with the secondRI report on the physical uplink control channel with the second format,any one of the first RI report and the second RI report may be dropped.

(3) In the above first aspect, in a case that in a certain subframe, thefirst RI report on the physical uplink control channel with the secondformat collides with the second RI report on the physical uplink controlchannel with the second format, and the physical uplink control channelwith the first format is configured, the first RI and the second RI maybe reported on an identical physical uplink control channel with thefirst format, and in a case that in a certain subframe, the first RIreport on the physical uplink control channel with the second formatcollides with the second RI report on the physical uplink controlchannel with the second format, and the physical uplink control channelwith the first format is not configured, any one of the first RI reportand the second RI report may be dropped.

(4) In the above first aspect, the first format may be a PUCCH formatfor a prescribed number of CSI reports (e.g., fifth PUCCH format), thesecond format may be a PUCCH format for one CSI report (e.g., thirdPUCCH format).

(5) The base station device 3 in the above second aspect may be a basestation device 3 including a reception unit 305 which receives firstrank indicator (RI) report for a first channel state information (CSI)process from the terminal device 1 and receives second RI report for asecond CSI process from the terminal device 1, and in a case that in acertain subframe, the first RI report collides with the second RIreport, and the first RI and the second RI are reported on an identicalphysical uplink control channel (PUCCH) with a first format, and thefirst CSI process is not a RI-reference CSI process of the second CSIprocess, the base station device 3 may receive both the first RI reportand the second RI report, and in a case that in a certain subframe, thefirst RI report collides with the second RI report, and the first RI andthe second RI are reported on an identical physical uplink controlchannel (PUCCH) with the first format, and the first CSI process is aRI-reference CSI process for the second CSI process, the base stationdevice 3 may receive any one of the first RI report and the second RIreport.

(6) In the above second aspect, in a case that in a certain subframe,the first RI report on the physical uplink control channel (PUCCH) withthe first format collides with the second RI report on the physicaluplink control channel (PUCCH) with the first format, the base station 3may receive the first RI report and the second RI report on an identicalphysical uplink control channel (PUCCH) with the first format, and in acase that in a certain subframe, the first RI report on the physicaluplink control channel (PUCCH) with the first format collides with thesecond RI report on the physical uplink control channel (PUCCH) with thesecond format, the base station device 3 may receive the first RI reportand the second RI report on an identical physical uplink control channel(PUCCH) with the first format, and in a case that in a certain subframe,the first RI report on the physical uplink control channel (PUCCH) withthe second format collides with the second RI report on the physicaluplink control channel (PUCCH) with the second format, the base stationdevice 3 may receive any one of the first RI report and the second RIreport.

(7) In the above second aspect, in a case that in a certain subframe,the first RI report on the physical uplink control channel (PUCCH) withthe second format collides with the second RI report on the physicaluplink control channel (PUCCH) with the second format, and the physicaluplink control channel (PUCCH) with the first format is configured, thebase station device 3 may receive the first RI report and the second RIreport on an identical physical uplink control channel (PUCCH) with thefirst format, and in a case that in a certain subframe, the first RIreport on the physical uplink control channel (PUCCH) with the secondformat collides with the second RI report on the physical uplink controlchannel (PUCCH) with the second format, and the physical uplink controlchannel (PUCCH) with the first format is not configured, the basestation device 3 may receive any one of the first RI report and thesecond RI report.

(8) In the above second aspect, the first format may be a PUCCH formatfor a prescribed number of CSI reports (e.g., fifth PUCCH format), thesecond format may be a PUCCH format for one CSI report (e.g., thirdPUCCH format).

(9) The terminal device 1 in a third aspect of the present invention maybe a terminal device 1 including a transmission unit 107 which reportschannel state information (CSI) for multiple CSI processes in a firstserving cell and channel state information in a second serving cell,wherein first channel state information for some of multiple CSIprocesses in the first serving cell is reported on a physical uplinkcontrol channel (PUCCH) with a first format, and second channel stateinformation for the rest of multiple CSI processes in the first servingcell is reported on a physical uplink control channel with the firstformat, and in a case that in a certain subframe, the second channelstate information report collides with the channel state informationreport in the second serving cell, the second channel state informationand the channel state information in the second serving cell may bereported on the physical uplink control channel with a second format.

(10) In the above third aspect, in a case that in a certain subframe,the second channel state information report collides with the channelstate information report in the second serving cell, and the physicaluplink control channel with the second format is configured, the secondchannel state information and the channel state information in thesecond serving cell may be reported on the physical uplink controlchannel with the second format.

(11) In the above third aspect, the physical uplink control channel withthe second format may be a physical uplink control channel for thechannel state information report in the second serving cell.

(12) In the above third aspect, each of the first channel stateinformation report, the second channel state information report, and thechannel state information report in the second serving cell may beconfigured through RRC signaling.

(13) In the above third aspect, the first format may be a PUCCH formatfor one channel state information report (e.g., third PUCCH format), andthe second format may be a PUCCH format for a prescribed number ofchannel state information reports (e.g., fifth PUCCH format).

(14) The terminal device 1 in a fourth aspect of the present inventionmay be a terminal device 1 including a reception unit 105 which receivesfirst information (e.g., DCI) indicating a first physical uplink controlchannel (PUCCH) resource with a first format and second information(e.g., DCI) indicating a second physical uplink control channel (PUCCH)resource with a second format, and a transmission unit 107 which reportsfirst channel state information (CSI) for some of multiple CSI processesin a first serving cell on the first physical uplink control channel andreports second channel state information for the rest of multiple CSIprocesses in the first serving cell on the second physical uplinkcontrol channel, and in a case that in a certain subframe, the firstchannel state information report on the first physical uplink controlchannel collides with the second channel state information report on thesecond physical uplink control channel, the first channel stateinformation and the second channel state information may be reported onthe second physical uplink control channel with the second format.

(15) The terminal device 1 in a fifth aspect of the present invention,the terminal device 1 according to the present embodiment may be aterminal device 1 including a reception unit 105 which receives firstinformation (e.g., DCI) indicating a first physical uplink controlchannel (PUCCH) resource with a first format, second information (e.g.,DCI) indicating a second physical uplink control channel resource withthe first format, and third information (e.g., DCI) indicating a thirdphysical uplink control channel resource with a second format, and atransmission unit 107 which reports first channel state information(CSI) for some of multiple CSI processes in a first serving cell on thefirst physical uplink control channel and reports second channel stateinformation for the rest of multiple CSI processes in the first servingcell on the second physical uplink control channel, and in a case thatin a certain subframe, the first channel state information reportcollides with the second channel state information report, the firstchannel state information and the second channel state information maybe reported on the third physical uplink control channel with the secondformat.

(16) The base station device 3 in a sixth aspect of the presentinvention may be a base station device 3 including a reception unit 305which receives a channel state information (CSI) report for multiple CSIprocesses in a first serving cell and a channel state information reportin a second serving cell, wherein first channel state information forsome of multiple CSI processes in the first serving cell is reported ona physical uplink control channel (PUCCH) with a first format, andsecond channel state information for the rest of multiple CSI processesin the first serving cell is reported on a physical uplink controlchannel with the first format, and in a case that in a certain subframe,the second channel state information report collides with the channelstate information report in the second serving cell, the second channelstate information and the channel state information in the secondserving cell may be reported on the physical uplink control channel witha second format.

(17) In the above sixth aspect, in a case that in a certain subframe,the second channel state information report collides with the channelstate information report in the second serving cell, and the physicaluplink control channel with the second format is configured, the secondchannel state information and the channel state information in thesecond serving cell may be reported on the physical uplink controlchannel with the second format.

(18) In the above sixth aspect, the physical uplink control channel withthe second format may be a physical uplink control channel for thechannel state information report in the second serving cell.

(19) In the above sixth aspect, each of the first channel stateinformation report, the second channel state information report, and thechannel state information report in the second serving cell may beconfigured through RRC signaling.

(20) In the above sixth aspect, the first format may be a PUCCH formatfor one channel state information report (e.g., third PUCCH format), andthe second format may be a PUCCH format for a prescribed number ofchannel state information reports (e.g., fifth PUCCH format).

(21) The base station device 3 in a seventh aspect of the presentinvention may be a base station device 3 including a transmission unit307 which transmits first information (e.g., DCI) indicating a firstphysical uplink control channel (PUCCH) resource with a first format andsecond information (e.g., DCI) indicating a second physical uplinkcontrol channel resource with a second format, and a reception unit 305which receives a first channel state information (CSI) report for someof multiple CSI processes in a first serving cell on the first physicaluplink control channel and receives a second channel state informationreport for the rest of multiple CSI processes in the first serving cellon the second physical uplink control channel, and in a case that in acertain subframe, the first channel state information report on thefirst physical uplink control channel collides with the second channelstate information report on the second physical uplink control channel,the first channel state information and the second channel stateinformation may be reported on the second physical uplink controlchannel with the second format.

(22) The base station device 3 in an eighth aspect of the presentinvention may be a base station device 3 including a transmission unit307 which transmits first information (e.g., DCI) indicating a firstphysical uplink control channel (PUCCH) resource with a first format,second information (e.g., DCI) indicating a second physical uplinkcontrol channel resource with the first format, and third information(e.g., DCI) indicating a third physical uplink control channel resourcewith a second format, and a reception unit 305 which receives firstchannel state information (CSI) for some of multiple CSI processes in afirst serving cell on the first physical uplink control channel andreceives second channel state information for the rest of multiple CSIprocesses in the first serving cell on the second physical uplinkcontrol channel, and in a case that in a certain subframe, the firstchannel state information report collides with the second channel stateinformation report, the first channel state information and the secondchannel state information may be reported on the third physical uplinkcontrol channel with the second format.

(23) The terminal device 1 in a ninth aspect of the present inventionmay be a terminal device 1 including a transmission unit 107 whichreports channel state information (CSI) for multiple subframe sets in afirst serving cell and channel state information in a second servingcell, wherein first channel state information for some of multiplesubframe sets in the first serving cell is reported on a physical uplinkcontrol channel (PUCCH) with a first format, and second channel stateinformation for the rest of multiple subframe sets in the first servingcell is reported on a physical uplink control channel with the firstformat, and in a case that in a certain subframe, the second channelstate information report collides with the channel state informationreport in the second serving cell, the second channel state informationand the channel state information in the second serving cell may bereported on the physical uplink control channel with a second format.

(24) In the above ninth aspect, in a case that in a certain subframe,the second channel state information report collides with the channelstate information report in the second serving cell, and the physicaluplink control channel with the second format is configured, the secondchannel state information and the channel state information in thesecond serving cell may be reported on the physical uplink controlchannel with the second format.

(25) In the above ninth aspect, the physical uplink control channel withthe second format may be a physical uplink control channel for thechannel state information report in the second serving cell.

(26) In the above ninth aspect, each of the first channel stateinformation report, the second channel state information report, and thechannel state information report in the second serving cell may beconfigured through RRC signaling.

(27) In the above ninth aspect, the first format may be a PUCCH formatfor one channel state information report (e.g., third PUCCH format), andthe second format may be a PUCCH format for a prescribed number ofchannel state information reports (e.g., fifth PUCCH format).

(28) The terminal device 1 in a tenth aspect of the present inventionmay be a terminal device 1 including a reception unit 105 which receivesfirst information (e.g., DCI) indicating a first physical uplink controlchannel (PUCCH) resource with a first format and second information(e.g., DCI) indicating a second physical uplink control channel (PUCCH)resource with a second format, and a transmission unit 107 which reportsfirst channel state information (CSI) for some of multiple subframe setsin a first serving cell on the first physical uplink control channel andreports second channel state information for the rest of multiplesubframe sets in the first serving cell on the second physical uplinkcontrol channel, and in a case that in a certain subframe, the firstchannel state information report on the first physical uplink controlchannel collides with the second channel state information report on thesecond physical uplink control channel, the first channel stateinformation and the second channel state information may be reported onthe second physical uplink control channel with the second format.

(29) The terminal device 1 in an eleventh aspect of the presentinvention may be a terminal device 1 including a reception unit 105which receives first information (e.g., DCI) indicating a first physicaluplink control channel (PUCCH) resource with a first format, secondinformation (e.g., DCI) indicating a second physical uplink controlchannel resource with the first format, and third information (e.g.,DCI) indicating a third physical uplink control channel resource with asecond format, and a transmission unit 107 which reports first channelstate information (CSI) for some of multiple subframes sets in a firstserving cell on the first physical uplink control channel and reportssecond channel state information for the rest of multiple subframe setsin the first serving cell on the second physical uplink control channel,and in a case that in a certain subframe, the first channel stateinformation report collides with the second channel state informationreport, the first channel state information and the second channel stateinformation may be reported on the third physical uplink control channelwith the second format.

(30) The base station device 3 in a twelfth aspect of the presentinvention may be a base station device 3 including a reception unit 305which receives a channel state information (CSI) report for multiplesubframe sets in a first serving cell and a channel state informationreport in a second serving cell, wherein first channel state informationfor some of multiple subframe sets in the first serving cell is reportedon a physical uplink control channel (PUCCH) with a first format, andsecond channel state information for the rest of multiple subframe setsin the first serving cell is reported on a physical uplink controlchannel with the first format, and in a case that in a certain subframe,the second channel state information report collides with the channelstate information report in the second serving cell, the second channelstate information and the channel state information in the secondserving cell may be reported on the physical uplink control channel witha second format.

(31) In the above twelfth aspect, in a case that in a certain subframe,the second channel state information report collides with the channelstate information report in the second serving cell, and the physicaluplink control channel with the second format is configured, the secondchannel state information and the channel state information in thesecond serving cell may be reported on the physical uplink controlchannel with the second format.

(32) In the above twelfth aspect, the physical uplink control channelwith the second format may be a physical uplink control channel for thechannel state information report in the second serving cell.

(33) In the above twelfth aspect, each of the first channel stateinformation report, the second channel state information report, and thechannel state information report in the second serving cell may beconfigured through RRC signaling.

(34) In the above twelfth aspect, the first format may be a PUCCH formatfor one channel state information report (e.g., third PUCCH format), andthe second format may be a PUCCH format for a prescribed number ofchannel state information reports (e.g., fifth PUCCH format).

(35) The base station device 3 in a thirteenth aspect of the presentinvention may be a base station device 3 including a transmission unit307 which transmits first information (e.g., DCI) indicating a firstphysical uplink control channel (PUCCH) resource with a first format andsecond information (e.g., DCI) indicating a second physical uplinkcontrol channel resource with a second format, and a reception unit 305which receives a first channel state information (CSI) report for someof multiple subframe sets in a first serving cell on the first physicaluplink control channel and receives a second channel state informationreport for the rest of multiple subframe sets in the first serving cellon the second physical uplink control channel, and in a case that in acertain subframe, the first channel state information report on thefirst physical uplink control channel collides with the second channelstate information report on the second physical uplink control channel,the first channel state information and the second channel stateinformation may be reported on the second physical uplink controlchannel with the second format.

(36) The base station device 3 in a fourteenth aspect of the presentinvention may be a base station device 3 including a transmission unit307 which transmits first information (e.g., DCI) indicating a firstphysical uplink control channel (PUCCH) resource with a first format,second information (e.g., DCI) indicating a second physical uplinkcontrol channel resource with the first format, and third information(e.g., DCI) indicating a third physical uplink control channel resourcewith a second format, and a reception unit 305 which receives firstchannel state information (CSI) for some of multiple subframe sets in afirst serving cell on the first physical uplink control channel andreceives second channel state information for the rest of multiplesubframe sets in the first serving cell on the second physical uplinkcontrol channel, and in a case that in a certain subframe, the firstchannel state information report collides with the second channel stateinformation report, the first channel state information and the secondchannel state information may be reported on the third physical uplinkcontrol channel with the second format.

This allows the uplink control information to be efficientlytransmitted.

A program running on each of the base station device 3 and the terminaldevice 1 according to the present invention may be a program thatcontrols a Central Processing Unit (CPU) and the like (a program forcausing a computer to operate) in such a manner as to realize thefunctions according to the above-described embodiments of the presentinvention. The information handled in these devices is temporarilystored in a Random Access Memory (RAM) while being processed.Thereafter, the information is stored in various types of read onlymemory (ROM) such as a Flash ROM and a Hard Disk Drive (HDD) and whennecessary, is read by the CPU to be modified or rewritten.

Moreover, the terminal device 1 and the base station device 3 accordingto the above-described embodiments may be partially realized by acomputer. This configuration may be realized by recording a program forrealizing such control functions on a computer-readable medium andcausing a computer system to read the program recorded on the recordingmedium for execution.

The “computer system” refers here to a computer system built into theterminal device 1 or the base station device 3, and the computer systemincludes an OS and hardware components such as a peripheral device.Furthermore, the “computer-readable recording medium” refers to aportable medium such as a flexible disk, a magneto-optical disk, a ROM,and a CD-ROM, and a storage device such as a hard disk built into thecomputer system.

Moreover, the “computer-readable recording medium” may include a mediumthat dynamically retains the program for a short period of time, such asa communication line that is used to transmit the program over a networksuch as the Internet or over a communication circuit such as a telephonecircuit, and a medium that retains, in that case, the program for afixed period of time, such as a volatile memory within the computersystem which functions as a server or a client. Furthermore, the programmay be configured to realize some of the functions described above, andalso may be configured to be capable of realizing the functionsdescribed above in combination with a program already recorded in thecomputer system.

Furthermore, the base station device 3 according to the above-describedembodiments can be realized as an aggregation (a device group)constituted of multiple devices. Each of devices constituting the devicegroup may be equipped with some or all portions of each function or eachfunctional block of the base station device 3 according to theabove-described embodiments. It is only required that the device groupitself include general functions or general functional blocks of thebase station device 3. Furthermore, the terminal device 1 according tothe above-described embodiments can communicate with the base stationdevice as the aggregation.

Furthermore, the base station device 3 according to the above-describedembodiment may be an Evolved Universal Terrestrial Radio Access Network(EUTRAN). Furthermore, the base station device 3 according to theabove-described embodiments may have some or all portions of thefunction of a node higher than an eNodeB.

Furthermore, some or all portions of each of the terminal device 1 andthe base station device 3 according to the above-described embodimentmay be realized as an LSI that is a typical integrated circuit or may berealized as a chip set. The functional blocks of each of the terminaldevice 1 and the base station device 3 may be individually realized as achip, or some or all of the functional blocks may be integrated into achip. Furthermore, the circuit integration technique is not limited tothe LSI, and the integrated circuit may be realized with a dedicatedcircuit or a general-purpose processor. Furthermore, if with advances insemiconductor technology, a circuit integration technology with which anLSI is replaced appears, it is also possible to use an integratedcircuit based on the technology.

Furthermore, according to the above-described embodiments, the terminaldevice is described as one example of a communication device, but thepresent invention is not limited to this, and can be applied to afixed-type electronic apparatus installed indoors or outdoors, or astationary-type electronic apparatus, for example, a terminal device ora communication device, such as an audio-video (AV) apparatus, a kitchenapparatus, a cleaning or washing machine, an air-conditioning apparatus,office equipment, a vending machine, and other household apparatuses.

The embodiments of the present invention have been described in detailabove referring to the drawings, but the specific configuration is notlimited to the embodiments and includes, for example, an amendment to adesign that falls within the scope that does not depart from the gist ofthe present invention. Furthermore, various modifications are possiblewithin the scope of the present invention defined by claims, andembodiments that are made by suitably combining technical meansdisclosed according to the different embodiments are also included inthe technical scope of the present invention. Furthermore, aconfiguration in which a constituent element that achieves the sameeffect is substituted for the one that is described according to theembodiments is also included in the technical scope of the presentinvention.

DESCRIPTION OF REFERENCE NUMERALS

-   1 (1A, 1B, 1C) Terminal device-   3 Base station device-   101 Higher layer processing unit-   103 Control unit-   105 Reception unit-   107 Transmission unit-   301 Higher layer processing unit-   303 Control unit-   305 Reception unit-   307 Transmission unit-   1011 Radio resource control unit-   1013 Scheduling information interpretation unit-   1015 Channel state information report control unit-   3011 Radio resource control unit-   3013 Scheduling unit-   3015 Channel state information report control unit

1. A terminal device comprising: transmission circuitry configuredand/or programmed to transmit first channel state information report,second channel state information report, and a scheduling request, in acertain subframe, in a case that there is only the first channel stateinformation report, the first channel state information report beingtransmitted on a first PUCCH resource, and in a case that there are thefirst channel state information report and the second channel stateinformation report, the first channel state information report and thesecond channel state information report being transmitted on a secondPUCCH resource different from the first PUCCH resource, the second PUCCHresource being used for transmission of the scheduling request, thefirst channel state information report, and the second channel stateinformation report.
 2. The terminal device according to claim 1, whereina first PUCCH format used in the first PUCCH resource is different froma second PUCCH format used in the second PUCCH resource.
 3. The terminaldevice according to claim 1, wherein the first channel state informationreport and the second channel state information report are channel stateinformation reports for CSI processes different from each other.
 4. Theterminal device according to claim 1, wherein the first channel stateinformation report and the second channel state information report arechannel state information reports for subframe sets different from eachother.
 5. A base station device comprising: reception circuitryconfigured and/or programmed to receive first channel state informationreport, second channel state information report, and a schedulingrequest from a terminal device, in a certain subframe, in a case thatthere is only the first channel state information report, the firstchannel state information report being received on a first PUCCHresource, and in a case that there are the first channel stateinformation report and the second channel state information report, thefirst channel state information report and the second channel stateinformation report being received on a second PUCCH resource differentfrom the first PUCCH resource, the second PUCCH resource being used forreception of the scheduling request, the first channel state informationreport, and the second channel state information report.
 6. The basestation device according to claim 5, wherein a first PUCCH format usedin the first PUCCH resource is different from a second PUCCH format usedin the second PUCCH resource.
 7. The base station device according toclaim 5, wherein the first channel state information report and thesecond channel state information report are channel state informationreports for CSI processes different from each other.
 8. The base stationdevice according to claim 5, wherein the first channel state informationreport and the second channel state information report are channel stateinformation reports for subframe sets different from each other.
 9. Acommunication method of a terminal device, the communication methodcomprising: transmitting first channel state information report, secondchannel state information report, and a scheduling request; and in acertain subframe, in a case that there is only the first channel stateinformation report, transmitting the first channel state informationreport on a first PUCCH resource, and in a case that there are the firstchannel state information report and the second channel stateinformation report, transmitting the first channel state informationreport and the second channel state information report on a second PUCCHresource different from the first PUCCH resource, the second PUCCHresource being used for transmission of the scheduling request, thefirst channel state information report, and the second channel stateinformation report.
 10. The communication method according to claim 9,wherein a first PUCCH format used in the first PUCCH resource isdifferent from a second PUCCH format used in the second PUCCH resource.11. A communication method of a base station device, the communicationmethod comprising: receiving first channel state information report,second channel state information report, and a scheduling request from aterminal device; and in a certain subframe, in a case that there is onlythe first channel state information report, receiving the first channelstate information report on a first PUCCH resource, and in a case thatthere are the first channel state information report and the secondchannel state information report, receiving the first channel stateinformation report and the second channel state information report on asecond PUCCH resource different from the first PUCCH resource, thesecond PUCCH resource being used for reception of the schedulingrequest, the first channel state information report, and the secondchannel state information report.
 12. The communication method accordingto claim 11, wherein a first PUCCH format used in the first PUCCHresource is different from a second PUCCH format used in the secondPUCCH resource. 13-16. (canceled)